External rotor type hub motor with built-in gear set

Abstract

The utility model relates to the field of speed reduction motors, in particular to a built-in gear set outer rotor type hub motor which comprises a shell, a rotor rotationally arranged in the shell, a stator fixedly connected in the shell and a planetary speed reduction assembly, the stator and the rotor are integrally of an annular structure, the rotor is arranged outside the stator in a sleeving mode, and the planetary speed reduction assembly is arranged in the shell. The planetary speed reduction assembly is arranged in the stator, and a connecting frame used for connecting the rotor and the input end of the planetary speed reduction assembly is arranged between the rotor and the planetary speed reduction assembly. The gear motor has the advantages that the axial size of the gear motor is reduced, and the gear motor can be conveniently applied to special fields.

Description

Technical Field

[0001] This application relates to the technical field of reduction motors, and particularly to an in-wheel motor with an internal gear set and an outer rotor type. Background Art

[0002] A reduction motor refers to an integrated body of a reducer and a motor. Usually, the reducer is axially arranged on one side of the motor along the output shaft of the motor. The output shaft of the motor is fixedly connected to the input shaft of the reducer through a coupling, and the housing of the reducer is fixedly connected to the housing of the motor through screws, achieving the effect of reducing speed and increasing torque.

[0003] The reducer and the motor are independent of each other, resulting in a relatively large size, which is not conducive to the application of reduction motors in some special fields, such as robots, manipulators, etc. With the progress and development of technology, there has also emerged a reduction motor in which the input shaft of the reducer and the output shaft of the motor are integrally formed to eliminate the coupling. For example, the reduction motor disclosed in the utility model patent with the publication number CN212392764U includes a motor body and a planetary reduction gear train. By directly using the motor shaft as the input shaft of the reduction mechanism, the coupling used to connect the motor shaft and the input shaft of the reducer in the related art is eliminated, thereby reducing the size of the reduction motor.

[0004] In the related art, although the coupling component is eliminated, to a certain extent, the axial size of the reduction motor is reduced, but in essence, the reducer is still arranged on one side of the motor, and there is still room for further reduction in its size. Utility Model Content

[0005] In order to further reduce the circumferential size of the reduction motor, this application provides an in-wheel motor with an internal gear set and an outer rotor type.

[0006] The in-wheel motor with an internal gear set and an outer rotor type provided by this application adopts the following technical solutions:

[0007] An in-wheel motor with an internal gear set and an outer rotor type includes a housing, and further includes a rotor rotatably arranged inside the housing, a stator fixedly connected inside the housing, and a planetary reduction assembly. Both the stator and the rotor are in an annular structure as a whole. The rotor is sleeved outside the stator, the planetary reduction assembly is arranged inside the stator, and a connecting frame for connecting the rotor and the input end of the planetary reduction assembly is arranged between the rotor and the planetary reduction.

[0008] By adopting the above technical solutions, the structure of an outer rotor motor is adopted, and the stator is set as an annular structure. The planetary reduction assembly is arranged inside the stator and is connected to the rotor through a connecting frame, which can change the layout in the related art where the planetary reduction assembly is arranged on one side of the motor, and reduce the overall axial size of the reduction motor.

[0009] Optionally, the connecting frame includes a connecting plate which is a rectangular plate, and two ends of the connecting plate are respectively connected to the rotor and the input end of the planetary reduction assembly.

[0010] By adopting the above technical solution, the connecting plate with a plate-like structure is used to connect the rotor and the input end of the planetary reduction assembly, realizing the connection between the rotor and the planetary reduction assembly; meanwhile, the connecting plate is of a plate-like structure, which can reduce the space occupied by the connecting frame, thereby ensuring the size of the reduction motor.

[0011] Optionally, an output disk is arranged inside the housing. The output disk is rotatably connected to the housing, and one side of the disk extends to the outside of the housing. The output end of the planetary reduction assembly is connected to the output disk.

[0012] By adopting the above technical solution, after the rotor is decelerated by the planetary reduction assembly, it is transmitted to the component to be driven through the output disk, realizing the drive of external components.

[0013] Optionally, the output disk includes an inner connecting disk and an outer connecting disk. The inner connecting disk and the outer connecting disk are respectively arranged on two sides of the planetary reduction assembly along the rotation axis of the rotor. A connecting block for connecting the inner connecting disk and the outer connecting disk is arranged between the inner connecting disk and the outer connecting disk. The output end of the planetary reduction assembly is connected to the inner connecting disk or the outer connecting disk.

[0014] By adopting the above technical solution, the output disk is set as two interconnected connecting disks, and multiple parts are rotatably connected to the housing, making the output disk more stable during rotation.

[0015] Optionally, a thickening block is arranged on the inner side wall of the housing, and a wire row slot is opened on the inner side wall of the thickening block.

[0016] By adopting the above technical solution, a circuit board for controlling the energization of the stator is arranged on one side of the motor away from the outer connecting disk. After the wire is connected to the stator, it extends towards the thickening block and then enters the row slot. Then it extends along the side wall of the row slot in the axial direction of the housing towards the circuit board. The row slot can limit the wire, making the wire overall beautiful and orderly, and facilitating the maintenance of the motor.

[0017] Optionally, an opening is arranged on one side of the housing away from the outer connecting disk, and an end cover for blocking the opening is detachably connected.

[0018] By adopting the above technical solution, by removing the end cover, the internal structure of the housing can be exposed, facilitating the maintenance of the motor and also facilitating the assembly of the motor.

[0019] Optionally, a blocking plate is arranged in the row slot, and the wire connected to the stator is located on the side of the blocking plate away from the rotor.

[0020] By adopting the above technical solution, the blocking plate is used to prevent the wire from moving towards the rotor, reducing the occurrence of the rotor being stuck due to interference with the wire during the rotation of the rotor.

[0021] Optionally, the wire groove forms an opening on the side close to the end cover, and the blocking plate can slide out from the opening.

[0022] By adopting the above technical solution, during the assembly of the motor, first press the wire into the wire groove from the opening close to the rotor of the wire groove, and then insert the blocking plate into the wire groove, thus facilitating the arrangement of the wire and the limitation of the wire.

[0023] Optionally, a hub is provided on the output disk.

[0024] By adopting the above technical solution, a hub is provided on the output disk, enabling the motor to be applied to the robot walking mechanism.

[0025] Optionally, the hub includes a rotating shell and a rubber tire sleeved outside the rotating shell, and the rotating shell covers the outside of the outer shell.

[0026] By adopting the above technical solution, the rubber tire outside the rotating shell provides an installation position, and at the same time covers the outer shell inside itself, effectively utilizing the space inside itself and facilitating the application of the hub to the robot.

[0027] In summary, the present application includes the following beneficial technical effects: the stator is of an annular structure, and the planetary reduction assembly is arranged inside the stator, thereby reducing the overall axial dimension of the reduction motor; Description of the Drawings

[0028] Figure 1 is the overall sectional structure schematic diagram of the embodiment of the present application.

[0029] Figure 2 is the Figure 1 enlarged view of part A in the embodiment of the present application.

[0030] Figure 3 is the exploded view of the embodiment of the present application along the axis direction of the rotor.

[0031] Figure 4 is the structural schematic diagram of the rotor of the embodiment of the present application.

[0032] Figure 5 is the partial structural schematic diagram of the outer shell of the embodiment of the present application.

[0033] Figure 6 is the structural schematic diagram of the hub of the embodiment of the present application.

[0034] Figure 7 is the partial structural schematic diagram of the hub of the embodiment of the present application.

[0035] Reference signs: 1, housing; 11, output hole; 2, rotor; 21, rotating ring; 22, permanent magnet; 3, stator; 31, fixed ring; 32, electromagnet; 4, planetary reduction assembly; 41, planet carrier; 42, planet gear; 43, sun gear; 5, connecting frame; 51, connecting ring; 52, connecting plate; 53, connecting cylinder; 54, connecting shaft; 6, output disc; 61, inner connecting disc; 62, outer connecting disc; 63, connecting block; 7, mating ring; 71, limiting groove; 72, limiting block; 73, retaining ring; 8, thickening block; 81, wire slot; 82, sealing plate; 83, extension; 9, hub; 91, rotating housing; 911, rotating cover; 912, rotating plate; 92, rubber tire; 93, inserting block; 94, inserting slot; 95, connecting member; 96, flange plate. Detailed implementation mode

[0036] The following further elaborates on this application Figures 1-5 in conjunction with the accompanying drawings.

[0037] The embodiment of this application discloses an in-wheel motor with an internal gear set and an outer rotor.

[0038] Embodiment 1

[0039] Referring to Figure 1 and Figure 2 , an in-wheel motor with an internal gear set and an outer rotor includes a housing 1, a rotor 2 rotatably connected inside the housing 1, and a stator 3 fixedly connected inside the motor housing 1. The rotor 2 is integrally annular, the stator 3 is arranged inside the rotation, and the stator 3 is also of an annular structure. A planetary reduction assembly 4 is arranged inside the stator 3. A connecting frame 5 is arranged between the rotor 2 and the input end of the planetary reduction assembly 4, so that the rotation of the rotor 2 can drive the reduction assembly to operate, realizing the reduction of the motor. At the same time, the planetary reduction assembly 4 is installed inside the stator 3, thereby further reducing the axial dimension of the motor.

[0040] Referring to Figure 1 and Figure 3 , the rotor 2 includes a circular rotating ring 21 and permanent magnets 22. In this embodiment, the housing 1 is integrally of a cylindrical shell structure. The rotating ring 21 is coaxially arranged inside the housing 1 and can rotate around its own axis. A plurality of permanent magnets 22 are provided, and the plurality of permanent magnets 22 are fixedly connected to the inner side wall of the rotating ring 21 at equal intervals along the circumferential direction of the rotating ring 21. The stator 3 includes a fixed ring 31 and an electromagnet 32. The fixed ring 31 is also of a circular ring structure, and the fixed ring 31 is coaxially arranged inside the rotating ring 21. The electromagnets 32 are arranged at equal intervals along the circumferential direction of the fixed ring 31 on the outer side wall of the fixed ring 31. Here, the electromagnet 32 is an iron core wound with a coil. By the interaction between the energization sequence of different electromagnets 32 and the permanent magnets 22, the rotor 2 can be driven to rotate.

[0041] Reference Figure 1 and Figure 3 As shown in FIGS. Figure 3 and , the planetary reduction assembly 4 includes a planet carrier 41, planet gears 42 and a sun gear 43. The planet carrier 41 is coaxially arranged inside the fixed ring 31 and fixedly connected to the fixed ring 31. The sun gear 43 is coaxially arranged with the planet carrier 41. The planet gears 42 are located between the sun gear 43 and the planet carrier 41, and a plurality of planet gears 42 are evenly spaced along the circumferential direction of the planet carrier 41. In this embodiment, three planet gears 42 are provided.

[0042] Reference Figure 1 and Figure 3 As shown in FIGS. Figure 1 and Figure 3 , the connecting frame 5 includes a connecting ring 51, a connecting plate 52 and a connecting cylinder 53. The connecting ring 51 is inserted inside the rotating ring 21 and is in interference fit with the rotating ring 21 so that the connecting ring 51 is fixedly connected to the rotating ring 21. The connecting cylinder 53 is of a circular cylindrical structure. The connecting cylinder 53 is coaxially arranged with the sun gear 43. A connecting shaft 54 is coaxially arranged on the sun gear 43. The connecting shaft 54 is inserted into the connecting cylinder 53 and fixedly connected to the connecting cylinder 53. The connecting plate 52 is in the shape of a rectangular plate. One end of the connecting plate 52 is welded to the connecting ring 51, and the other end is welded to the connecting cylinder 53. When the rotating ring 21 rotates, it can drive the sun gear 43 to rotate. A plurality of connecting plates 52 can be evenly spaced around the axis of the sun gear 43 to improve the connection stability between the connecting ring 51 and the connecting cylinder 53.

[0043] Reference Figure 1 and Figure 3 As shown in FIGS. Figure 1 and Figure 3 , a circular output disk 6 is coaxially and rotatably arranged on the housing 1. An output hole 11 is formed in the housing 1 corresponding to the output disk 6. The output disk 6 extends to the outside of the housing 1 to facilitate the connection of the output disk 6 to an external component to be driven. The planet gear 42 is rotatably connected to the output disk 6. When the planet gear 42 orbits around the sun gear 43, it can drive the output disk 6 to rotate.

[0044] Reference Figure 1 and Figure 3, the output disk 6 includes an outer connection disk 62 and an inner connection disk 61. The outer connection disk 62 and the inner connection disk 61 are respectively arranged on both sides of the planet gear 42. The planet gear 42 is rotationally connected to the inner connection disk 61 around its own circumference. The outer connection disk 62 is rotatably arranged in the output hole 11, and the inner connection disk 61 is rotatably arranged in the fixing ring 31. A connecting block 63 is arranged between the outer connection disk 62 and the inner connection disk 61. The connecting block 63 is arranged corresponding to the gap between two adjacent planet gears 42. Both sides of the connecting block 63 are respectively abutted against the inner connection disk 61 and the outer connection disk 62. Through holes are formed in the inner connection disk 61 and the connecting block 63, and threaded grooves are correspondingly formed in the outer connection disk 62. Screws pass through the inner connection disk 61 and the connecting block 63 and are threadedly connected in the threaded grooves, realizing the fixed connection between the inner connection disk 61 and the outer connection disk 62. The inner connection disk 61 and the outer connection disk 62 are both rotationally connected to the housing 1, thereby improving the stability of the overall rotation of the output disk 6.

[0045] Refer to Figure 3 and Figure 4 , a circular ring-shaped fitting ring 7 is coaxially and fixedly arranged between the fixing ring 31 and the planet carrier 41. The planet carrier 41 is press-fitted in the fitting ring 7, which is convenient for the installation of the planet carrier 41. At the same time, it can prevent the planet carrier 41 from contacting the fixing ring 31, reducing the wear of the stator 3 and facilitating the maintenance of the motor. A limiting groove 71 penetrating along its own axial direction is formed on the outer side wall of the fitting ring 7, and a limiting block 72 is correspondingly formed on the inner side wall of the fixing ring 31. The limiting block 72 is embedded in the limiting groove 71 to prevent the fixing ring 31 and the fitting ring 7 from rotating relative to each other and generating friction, further reducing the possibility of wear of the stator 3.

[0046] Refer to Figure 1 and Figure 2 , the inner connection disk 61 is also arranged inside the fitting ring 7. A bearing is arranged between the fitting ring 7 and the inner connection disk 61 to realize the rotation of the inner connection disk 61. Combining Figure 4 , a retaining ring 73 is arranged between the bearing and the planet carrier 41. The retaining ring 73 is integrally formed with the fitting ring 7. Thus, the bearing and the planet carrier 41 are spaced apart, reducing the possibility of the bearing rubbing against the planet carrier 41. The inner side wall of the retaining ring 73 is located outside the inner ring of the bearing to reduce the possibility of friction between the inner ring of the bearing and the retaining ring 73 when the inner ring of the bearing rotates, improving the stability of the inner connection disk 61 during rotation.

[0047] Refer to Figure 1 and Figure 3 , a through hole is coaxially formed on the outer connection disk 62. A connecting shaft 54 is also arranged on the side of the sun gear 43 close to the outer connection disk 62. The connecting shaft 54 is rotationally fitted in the through hole on the outer connection disk 62, thereby being able to support the sun gear 43, improving the overall radial force resistance ability of the sun gear 43, and improving the stability of the sun gear 43 during rotation.

[0048] Reference Figure 1 and Figure 3 , one end of the housing 1 away from the output hole 11 is open, and the end cover for blocking the opening is fixedly connected by screws to facilitate the assembly of each component of the motor.

[0049] Reference Figure 1 and Figure 5 , an arc-shaped thickening block 8 is integrally formed coaxially on the inner side wall of the housing 1. A wire groove 81 is formed on the inner side wall of the thickening block 8, and the wire groove 81 is provided with an opening on the side away from the output hole 11. The wire connected to the stator 3 first extends radially along the housing 1 into the wire groove 81, and then extends out of the wire groove 81 along the axial direction of the housing 1 and is connected to the circuit board for controlling the energization of the stator 3.

[0050] Reference Figure 1 and Figure 5 , a blocking plate 82 is arranged in the wire groove 81, and the blocking plate 82 is used to block the opening on the inner side wall of the wire groove 81. Extension parts 83 are arranged on two parallel side surfaces of the wire groove 81 parallel to the axis of the housing 1. The blocking plate 82 is inserted into the wire groove 81 along the axial direction of the housing 1; the extension parts 83 can prevent the blocking plate 82 from disengaging from the wire groove 81 along the radial direction of the housing 1. The wire is located on the side of the blocking plate 82 away from the stator 3, so as to prevent the wire from moving towards the stator 3, and further improve the stability during the rotation of the stator 3. The blocking plate 82 can be removed from the wire groove 81. During the production process of the motor, the wire can be pressed into the wire groove 81 from the inner side wall of the housing 1, and then the blocking plate 82 is inserted to limit the wire, thus facilitating the production and manufacture of the motor.

[0051] The implementation principle of a hub motor of an internal gear set external rotor type in an embodiment of the present application is as follows: the stator 3 has an annular structure, and the planetary reduction assembly 4 is arranged inside the stator 3, breaking the layout that the planetary reduction mechanism is arranged on one side of the motor and reducing the overall axial dimension of the reduction motor.

[0052] Embodiment 2

[0053] Reference Figure 6 and Figure 7, the difference between this embodiment and the embodiment is that in this embodiment, a hub 9 is provided on the output disk 6 of the motor. The hub 9 includes a rotating shell 91 that covers the outside of the housing 1 and is generally cylindrical. The rotating shell 91 includes a rotating plate 912 and a rotating cover 911. The rotating cover 911 is a shell structure with an opening on one side. The rotating plate 912 is generally plate-shaped and seals the opening of the rotating cover 911. The rotating plate 912 is rotatably connected to the housing 1, and a bearing is provided between the rotating plate 912 and the housing 1 to improve the smoothness of the rotation of the rotating plate 912. The rotating cover 911 is fixedly connected to the output disk 6 by screws, and the rotation of the output disk 6 can drive the rotation of the rotating cover 911. A rubber tire 92 is sleeved outside the rotating cover 911, and friction lines are provided on the outer side wall of the rubber tire 92.

[0054] Referring to Figure 6 and Figure 7 , in order to improve the stability of the rubber tire 92 after installation, a convex-shaped insertion block 93 is provided on the inner side wall of the rubber tire 92, and a slot 94 is correspondingly provided on the outer side wall of the rotating groove. The insertion block 93 is embedded in the slot 94, so that the rubber tire 92 can be limited and prevented from rotating relative to the rotating cover 911.

[0055] Referring to Figure 6 and Figure 7 , a connecting member 95 is provided on the side of the housing 1 away from the output disk 6. The connecting member 95 is generally cylindrical in structure. One end of the connecting member 95 is coaxially welded to the housing 1, and the other end passes through the rotating plate 912 and extends to the outside of the rotating cover 911. A bearing is sleeved on the connecting member 95, and a mounting hole is correspondingly provided on the rotating plate 912 for the bearing. The rotating plate 912 is sleeved on the bearing to realize the rotational connection between the housing 1 and the rotating plate 912. A flange 96 is provided at the end of the connecting member 95 away from the housing 1 to facilitate the connection of the whole motor to the chassis of the trolley. A wire groove is provided on the connecting member 95 for the cable supplying power to the motor to pass through.

[0056] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An internal gear set outer rotor type hub motor, comprising a housing (1), a rotor (2) rotatably arranged inside the housing (1), a stator (3) fixedly connected inside the housing (1), and a planetary reduction assembly (4), characterized in that: The stator (3) and the rotor (2) are both of annular structure as a whole; the rotor (2) is sleeved outside the stator (3); the planetary reduction assembly (4) is arranged inside the stator (3); and a connecting frame (5) for connecting the rotor (2) and the input end of the planetary reduction assembly (4) is arranged between the rotor (2) and the planetary reduction assembly.

2. The inner gear set outer rotor type hub motor according to claim 1, characterized in that: The connecting frame (5) comprises a connecting plate (52), the connecting plate (52) being a rectangular plate, and the two ends of the connecting plate (52) being respectively connected to the rotor (2) and the input end of the planetary reduction assembly (4).

3. The inner gear set outer rotor type hub motor according to claim 1, characterized in that: An output disk (6) is disposed inside the housing (1), the output disk (6) is rotatably connected to the housing (1), and one side of the output disk (6) extends to the outside of the housing (1), and the output end of the planetary reduction assembly (4) is connected to the output disk (6).

4. The inner gear set outer rotor type hub motor according to claim 3, characterized in that: The output disk (6) comprises an inner connecting disk (61) and an outer connecting disk (62); the inner connecting disk (61) and the outer connecting disk (62) are respectively arranged on both sides of the planetary reduction assembly (4) along the rotation axis of the rotor (2); a connecting block (63) for connecting the inner connecting disk (61) and the outer connecting disk (62) is arranged between the inner connecting disk (61) and the outer connecting disk (62); and the output end of the planetary reduction assembly (4) is connected to the inner connecting disk (61) or the outer connecting disk (62).

5. The inner gear set outer rotor type hub motor according to claim 1, characterized in that: A thickening block (8) is provided on the inner side wall of the housing (1), and a wiring groove (81) for accommodating wires is provided on the inner side wall of the thickening block (8).

6. The inner gear set outer rotor type hub motor according to claim 5, characterized in that: An opening is provided on a side of the housing (1) away from the external connection disk (62), and an end cap for sealing the opening is detachably connected thereto.

7. The inner gear set outer rotor type hub motor according to claim 6, characterized in that: A blocking plate (82) is provided in the cable routing groove (81), and a wire connected to the stator (3) is located on a side of the blocking plate (82) away from the rotor (2).

8. The inner gear set outer rotor type hub motor according to claim 7, characterized in that: The cable routing slot (81) forms an opening on one side close to the end cover, and the blocking plate (82) can slide out from the opening.

9. The inner gear set outer rotor type hub motor according to claim 3, characterized in that: The output disc (6) is provided with a wheel hub (9).

10. The inner gear set outer rotor type hub motor according to claim 8, characterized in that: The wheel hub (9) comprises a rotating shell (91) and a rubber tire (92) sleeved on the outside of the rotating shell (91); the rotating shell (91) is covered on the outside of the outer shell (1).

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