Isolation assembly, planetary reducer and driving and speed reducing integrated device

Abstract

The utility model relates to the technical field of driving and speed reducing integrated devices, and discloses an isolation assembly, a planetary reducer and a driving and speed reducing integrated device. The isolation assembly comprises an isolation piece and a meshing piece, the two opposite sides of the isolation piece are provided with a first isolation face and a second isolation face respectively, and the isolation piece is provided with a connecting hole. The meshing piece is located in the connecting hole and fixedly connected with the isolation piece, and the meshing piece is flush with the first isolation face and the second isolation face. Thus, the isolation assembly, the sun gear of the second planetary gear assembly and the gear support are fixedly connected in sequence and rotate synchronously, friction between the isolation assembly and the gear support is avoided, the isolation assembly only rubs with the planetary gear of the second planetary gear assembly, and in other words, only one side face of the isolation assembly is rubbed. According to the planetary reducer, the abrasion speed of the isolation assembly is reduced, the service life of the isolation assembly is prolonged, meanwhile, noise generated when the planetary reducer works is reduced, and the mute effect of the planetary reducer is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of driving and reducing integrated devices, and in particular relates to an isolation component, a planetary reducer and a driving and reducing integrated device. Background Art

[0002] A planetary reducer is a power transmission mechanism that uses a gear speed converter to reduce the number of revolutions of the motor to the desired number of revolutions and obtain a larger torque. The gear with fewer teeth on the transmission shaft of the planetary reducer meshes with the larger gear on the output shaft to achieve the purpose of deceleration. Ordinary reducers also have several pairs of gears with the same principle meshing to achieve the ideal deceleration effect. The ratio of the number of teeth of the large and small gears is the transmission ratio. Since one set of planetary gear assemblies cannot meet a larger transmission ratio, sometimes multiple sets of planetary gear assemblies are required to meet the user's requirements for a larger transmission ratio.

[0003] In the related art, in order to improve the structural compactness of the planetary reducer, the gap between two adjacent sets of planetary gear assemblies is relatively small, which leads to the risk of mutual interference between the two adjacent sets of planetary gear assemblies. In order to avoid mutual interference between the two adjacent sets of planetary gear assemblies, a gasket is usually provided between the two adjacent sets of planetary gear assemblies to isolate the two sets of planetary gear assemblies and ensure the normal operation of each planetary gear assembly.

[0004] However, the two sides of the gasket rub against the two sets of planetary gear assemblies respectively, resulting in more severe wear of the gasket, resulting in a shorter service life of the gasket, which in turn causes a higher frequency of replacement of the gasket, and also causes the planetary reducer to make louder noise. Utility Model Content

[0005] In order to address the deficiencies of the prior art, the utility model provides an isolation component, a planetary reducer and a drive-reduction integrated device, wherein only one side of the isolation component is subjected to friction, thereby reducing the wear rate of the isolation component and extending the service life of the isolation component. At the same time, it also reduces the noise of the planetary reducer during operation and improves the silent effect of the planetary reducer.

[0006] The technical effects to be achieved by the utility model are achieved through the following aspects:

[0007] In a first aspect, the utility model provides an isolation assembly, comprising:

[0008] An isolation sheet, wherein the first isolation surface and the second isolation surface are respectively disposed on opposite sides of the isolation sheet, and the isolation sheet is provided with a connecting hole; and

[0009] An engaging member is located in the connecting hole and is fixedly connected to the isolation sheet.

[0010] In some implementations, the number of the engagement members is two, and the two engagement members are symmetrically arranged in the connection hole; and / or,

[0011] The engagement member comprises a plurality of engagement teeth, each of which is located in the connection hole and fixedly connected to the isolation sheet, and the plurality of engagement teeth are sequentially spaced apart along the circumference of the connection hole.

[0012] In this implementation, the two engagement members are symmetrically arranged in the connection hole, so that the two engagement members are clamped on the corresponding sun gear together, thereby making the connection between the engagement members and the corresponding sun gear more stable.

[0013] In some implementations, the engaging member and the isolation sheet are stamped structures.

[0014] In some implementations, a circular arc inner wall is provided in the connection hole, and the circular arc inner wall is staggered with the engagement member.

[0015] In a second aspect, the utility model provides a planetary reducer, comprising an isolation assembly according to any of the above implementations, the planetary reducer further comprising:

[0016] The mounting shell forms a speed reduction chamber;

[0017] a first planetary gear assembly;

[0018] a gear bracket; and

[0019] A second planetary gear assembly, wherein the first planetary gear assembly, the gear bracket and the second planetary gear assembly are sequentially connected and are all disposed in the deceleration chamber;

[0020] Wherein, the isolation sheet is sleeved on the second planetary gear assembly, the first isolation surface abuts against the gear bracket, the second isolation surface abuts against the second planetary gear assembly, and the meshing member meshes with the second planetary gear assembly.

[0021] In some implementations, the isolation plate is formed with an outer peripheral edge, and the outer peripheral edge is spaced apart from the inner wall of the deceleration chamber.

[0022] In some implementations, an inner wall of the connecting hole is spaced apart from the second planetary gear assembly.

[0023] In some implementations, the first planetary gear assembly includes a first sun gear and a first planetary gear, the first sun gear is disposed in the reduction chamber, a plurality of the first planetary gears are disposed around the first sun gear, each of the first planetary gears is respectively meshed with the first sun gear and the mounting shell, and each of the first planetary gears is also fixedly connected to the gear bracket.

[0024] In some implementations, the second planetary gear assembly includes a second sun gear and a second planetary gear, the second sun gear is disposed in the reduction chamber and fixedly connected to the gear bracket, a plurality of second planetary gears are disposed around the second sun gear, and each of the second planetary gears is respectively meshed with the second sun gear and the mounting shell.

[0025] In a third aspect, the utility model provides an integrated drive-reduction device, comprising a drive motor and a planetary reducer of any of the above-mentioned implementation methods, wherein the mounting shell is connected to the outer casing of the drive motor, and the first planetary gear assembly is sleeved on the power output end of the drive motor.

[0026] In summary, the utility model has at least the following benefits:

[0027] The isolation component provided by the utility model is arranged between the gear bracket and the planetary gear assembly, wherein the gear bracket is fixedly connected to the sun gear of the corresponding planetary gear assembly; and because the meshing piece of the isolation component meshes with the sun gear of the corresponding planetary gear assembly, the isolation component, the sun gear of the corresponding planetary gear assembly and the gear bracket are fixedly connected in sequence and rotate synchronously, thereby avoiding friction between the isolation component and the gear bracket, so that the isolation component only rubs with the planetary gear of the adjacent planetary gear assembly, that is, only one side of the isolation component is subjected to friction, thereby reducing the wear speed of the isolation component, extending the service life of the isolation component, and at the same time reducing the noise of the planetary reducer during operation, thereby improving the quiet effect of the planetary reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A cross-sectional view of a planetary reducer according to some embodiments;

[0029] Figure 2 for Figure 1 The partial structural diagram of the planetary reducer shown;

[0030] Figure 3 for Figure 1 A schematic diagram of the structure of the isolation assembly of the planetary reducer shown;

[0031] Figure 4 It is a schematic diagram of the structure of a driving and reducing device in some embodiments.

[0032] In the figure, reference numeral 10 is provided, and a driving and decelerating integrated device is provided;

[0033] 10a, planetary reducer;

[0034] 100, isolation assembly; 110, isolation sheet; 111, connection hole; 112, first isolation surface; 113, second isolation surface; 114, arc inner wall; 115, outer periphery; 120, meshing member; 121, meshing teeth;

[0035] 200, mounting shell; 201, speed reduction chamber;

[0036] 300, first planetary gear assembly; 310, first sun gear; 320, first planetary gear;

[0037] 400, gear bracket;

[0038] 500, second planetary gear assembly; 510, second sun gear; 520, second planetary gear;

[0039] 10b. Driving motor. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0042] Embodiment 1:

[0043] Please refer to the attached Figures 1 to 4 The isolation assembly 100 of the utility model includes an isolation sheet 110 and a meshing member 120. The isolation assembly 100 is used to be arranged between a gear support 400 and a planetary gear assembly. The gear support 400 is fixedly connected to the sun gear of the planetary gear assembly.

[0044] The isolating sheet 110 is provided with a connection hole 111, and the isolating sheet 110 is used to be sleeved on the corresponding sun gear through the connection hole 111. The isolating sheet 110 is provided with a first isolation surface 112 and a second isolation surface 113 on opposite sides thereof, respectively. The first isolation surface 112 is used to abut against the gear bracket 400, and the second isolation surface 113 is used to abut against the planetary gear of the corresponding planetary gear assembly. Preferably, the first isolation surface 112 is parallel to the second isolation surface 113.

[0045] The meshing member 120 is located in the connection hole 111 and is fixedly connected to the isolation plate 110 so that the meshing member 120 and the isolation plate 110 move synchronously. The meshing member 120 is flush with the first isolation surface 112 and the second isolation surface 113 respectively, that is, the two opposite side surfaces of the meshing member 120 are flush with the isolation plate 110. One side surface of the meshing member 120 abuts against the gear bracket 400, increasing the contact area between the isolation assembly 100 and the gear bracket 400. The other side surface of the meshing member 120 is used to abut against the planetary gear of the corresponding planetary gear assembly, increasing the contact area between the isolation assembly 100 and the planetary gear of the corresponding planetary gear assembly. The meshing member 120 is used to mesh with the sun gear of the corresponding planetary gear assembly, so that the isolation assembly 100 and the sun gear of the corresponding planetary gear assembly rotate synchronously.

[0046] In this embodiment, when the planetary reducer 10a is running, the gear bracket 400, the corresponding sun gear and the isolation assembly 100 rotate synchronously, the corresponding planetary gears rotate around the corresponding sun gears, and the corresponding planetary gears respectively rub against the second isolation surface 113 of the isolation plate 110 and one side surface of the meshing member 120.

[0047] The isolation component 100 of the utility model is arranged between the gear bracket 400 and the planetary gear assembly, wherein the gear bracket 400 is fixedly connected to the sun gear of the corresponding planetary gear assembly; and because the meshing piece 120 of the isolation component 100 meshes with the sun gear of the corresponding planetary gear assembly, the isolation component 100, the sun gear of the corresponding planetary gear assembly and the gear bracket 400 are fixedly connected in sequence and rotate synchronously, thereby avoiding friction between the isolation component 100 and the gear bracket 400, so that the isolation component 100 only rubs against the planetary gear of the adjacent planetary gear assembly, that is, only one side of the isolation component 100 is subjected to friction, thereby reducing the wear rate of the isolation component 100, extending the service life of the isolation component 100, and at the same time reducing the noise of the planetary reducer 10a during operation, thereby improving the silent effect of the planetary reducer 10a.

[0048] In some preferred embodiments, there are two meshing members 120, which are symmetrically arranged in the connection hole 111, so that the two meshing members 120 are clamped on the corresponding sun gear together, thereby making the connection between the meshing member 120 and the corresponding sun gear more stable. Further, each meshing member 120 includes a plurality of meshing teeth 121 connected in sequence.

[0049] In some preferred embodiments, the meshing member 120 includes a plurality of meshing teeth 121, each meshing tooth 121 is located in the connecting hole 111 and is fixedly connected to the isolation plate 110, and the plurality of meshing teeth 121 are arranged in sequence and spaced apart along the circumference of the connecting hole 111, and the plurality of meshing teeth 121 are all used to mesh with a sun gear, thereby improving the meshing stability of the meshing member 120 and the corresponding sun gear.

[0050] In some preferred embodiments, the engaging member 120 and the isolation sheet 110 are stamped structures, which improves the connection strength between the engaging member 120 and the isolation sheet 110, that is, improves the structural stability of the isolation assembly 100.

[0051] Of course, in some other embodiments, the engagement member 120 and the isolation sheet 110 may also be formed separately, and the engagement member 120 is fixedly connected to the isolation sheet 110 via a fixing member. It is understood that the fixing member may be a fastener, a snap member or other existing fixing members.

[0052] In some preferred embodiments, a circular arc inner wall 114 is provided in the connection hole 111, and the circular arc inner wall 114 is staggered with the meshing member 120, so that part of the teeth of the corresponding sun gear are not meshed with the meshing member 120. In this embodiment, when installing the isolation assembly 100, it is necessary to push the isolation assembly 100 from one end of the sun gear to the other end of the sun gear so that the isolation assembly 100 is in contact with the gear bracket 400. Since part of the teeth of the sun gear are not meshed with the meshing member 120, the friction generated when pushing the isolation assembly 100 is reduced, and the smoothness of installing the isolation assembly 100 is improved.

[0053] It is understandable that in some other embodiments, the arc inner wall 114 in the connecting hole 111 may be eliminated, that is, the engaging member 120 surrounds the connecting hole 111 and the engaging member 120 completely covers the inner wall of the connecting hole 111 .

[0054] Embodiment 2:

[0055] This embodiment provides a planetary reducer 10a based on the above embodiment. Figure 1~2 .

[0056] A planetary reducer 10a includes an isolation assembly 100, a mounting shell 200, a first planetary gear assembly 300, a gear bracket 400, and a second planetary gear assembly 500. The mounting shell 200 forms a reduction chamber 201, and the first planetary gear assembly 300, the gear bracket 400, and the second planetary gear assembly 500 are sequentially connected and are all arranged in the reduction chamber 201.

[0057] The gear bracket 400 is fixedly connected to the sun gear of the second planetary gear assembly 500, so that the gear bracket 400 rotates synchronously with the sun gear of the second planetary gear assembly 500. The isolation plate 110 is sleeved on the sun gear of the second planetary gear assembly 500, the first isolation surface 112 of the isolation plate 110 abuts against the gear bracket 400, the second isolation surface 113 of the isolation plate 110 abuts against the planetary gear of the second planetary gear assembly 500, and the meshing member 120 meshes with the sun gear of the second planetary gear assembly 500, so that the sun gear of the second planetary gear assembly 500 drives the meshing member 120 to rotate, thereby making the isolation plate 110, the meshing member 120, the sun gear of the second planetary gear assembly 500 and the gear bracket 400 rotate synchronously.

[0058] In the planetary reducer 10a of the utility model, the isolation component 100 is arranged between the gear bracket 400 and the second planetary gear assembly 500, wherein the gear bracket 400 is fixedly connected to the sun gear of the second planetary gear assembly 500; and because the engagement piece 120 of the isolation component 100 is engaged with the sun gear of the second planetary gear assembly 500, the isolation component 100, the sun gear of the second planetary gear assembly 500 and the gear bracket 400 are fixedly connected in sequence and rotate synchronously, thereby avoiding friction between the isolation component 100 and the gear bracket 400, so that the isolation component 100 only rubs against the planetary gear of the second planetary gear assembly 500, that is, only one side of the isolation component 100 is subjected to friction, thereby reducing the wear rate of the isolation component 100, extending the service life of the isolation component 100, and at the same time reducing the noise during operation of the planetary reducer 10a, thereby improving the silent effect of the planetary reducer 10a.

[0059] In some preferred embodiments, the isolating sheet 110 is formed with an outer peripheral edge 115, and the outer peripheral edge 115 is spaced apart from the inner wall of the speed reduction chamber 201, so as to avoid the outer peripheral edge 115 of the isolating sheet 110 from contacting the mounting shell 200, further reducing the noise of the planetary reducer 10a, and further improving the mute effect of the planetary reducer 10a. It is understood that in some other embodiments, the outer peripheral edge 115 of the isolating sheet 110 may also contact the speed reduction chamber 201.

[0060] In some of the preferred embodiments, the inner wall of the connecting hole 111 is spaced apart from the second planetary gear assembly 500. Specifically, the inner wall of the connecting hole 111 is spaced apart from the sun gear of the second planetary gear assembly 500, so that there is space for fixing the engaging member 120 between the inner wall of the connecting hole 111 and the sun gear of the second planetary gear assembly 500, so that the isolation plate 110 reserves installation space for the engaging member 120, thereby ensuring the normal connection between the engaging member 120 and the isolation plate 110, and further ensuring the normal engagement of the engaging member 120 with the sun gear of the second planetary gear assembly 500.

[0061] Of course, in some other embodiments, the inner wall of the connecting hole 111 may also contact the sun gear of the second planetary gear assembly 500. Furthermore, the spacer 110 is further provided with a mounting groove, which is communicated with the connecting hole 111, and the meshing member 120 is located in the mounting groove and fixedly connected to the spacer 110, that is, the meshing member 120 is recessed in the inner wall of the connecting hole 111 to ensure that the meshing member 120 can mesh with the corresponding sun gear after the spacer 110 is sleeved on the corresponding sun gear.

[0062] In some preferred embodiments, the first planetary gear assembly 300 includes a first sun gear 310 and a first planetary gear 320. The first sun gear 310 is disposed in the reduction chamber 201. A plurality of first planetary gears 320 are disposed around the first sun gear 310. Each first planetary gear 320 is respectively meshed with the first sun gear 310 and the mounting shell 200. Each first planetary gear 320 is also fixedly connected to the gear bracket 400.

[0063] In some preferred embodiments, the second planetary gear assembly 500 includes a second sun gear 510 and a second planetary gear 520. The second sun gear 510 is disposed in the deceleration chamber 201 and is fixedly connected to the gear bracket 400. A plurality of second planetary gears 520 are disposed around the second sun gear 510. Each second planetary gear 520 is respectively meshed with the second sun gear 510 and the mounting shell 200. Each second planetary gear 520 is also abutted against the second isolation surface 113. Each second planetary gear 520 rubs against the second isolation surface 113 when rotating.

[0064] Embodiment 3:

[0065] This embodiment provides a driving and decelerating integrated device 10 based on the above embodiment. Figure 4 .

[0066] A driving and reducing integrated device 10 includes a planetary reducer 10a and a driving motor 10b, wherein a mounting shell 200 is connected to the outer shell of the driving motor 10b, and a first planetary gear assembly 300 is sleeved on the power output end of the driving motor 10b. Specifically, a sun gear of the first planetary gear assembly 300 is fixedly sleeved on the power output end of the driving motor 10b, so that the driving motor 10b drives the first planetary gear assembly 300.

[0067] In the drive-reduction integrated device of the utility model, the isolation component 100 is arranged between the gear bracket 400 and the second planetary gear assembly 500, wherein the gear bracket 400 is fixedly connected to the sun gear of the second planetary gear assembly 500; and because the engagement piece 120 of the isolation component 100 is engaged with the sun gear of the second planetary gear assembly 500, the isolation component 100, the sun gear of the second planetary gear assembly 500 and the gear bracket 400 are fixedly connected in sequence and rotate synchronously, thereby avoiding friction between the isolation component 100 and the gear bracket 400, so that the isolation component 100 only rubs against the planetary gear of the second planetary gear assembly 500, that is, only one side of the isolation component 100 is subjected to friction, thereby reducing the wear rate of the isolation component 100, extending the service life of the isolation component 100, and at the same time reducing the noise of the planetary reducer 10a during operation, thereby improving the silent effect of the planetary reducer 10a.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0070] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0071] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. An isolation component, characterized in that: include: An isolation sheet (110), wherein two opposite sides of the isolation sheet (110) are respectively provided with a first isolation surface (112) and a second isolation surface (113), and the isolation sheet (110) is provided with a connecting hole (111); and An engaging member (120), wherein the engaging member (120) is located in the connecting hole (111) and is fixedly connected to the isolation sheet (110).

2. The isolation assembly according to claim 1, characterized in that The number of the engagement members (120) is two, and the two engagement members (120) are symmetrically arranged in the connection hole (111); and / or, The meshing member (120) comprises a plurality of meshing teeth (121), each of the meshing teeth (121) being located in the connecting hole (111) and fixedly connected to the isolation sheet (110), and the plurality of meshing teeth (121) being arranged in sequence and spaced apart along the circumference of the connecting hole (111).

3. The isolation assembly according to claim 1, characterized in that The engaging member (120) and the isolation sheet (110) are stamped structures.

4. The isolation assembly according to claim 1, characterized in that An arc inner wall (114) is provided in the connection hole (111), and the arc inner wall (114) and the engaging member (120) are staggered.

5. A planetary reducer, characterized in that: The isolation assembly (100) according to any one of claims 1 to 4, wherein the planetary reducer (10a) further comprises: A mounting shell (200) is formed with a speed reduction chamber (201); A first planetary gear assembly (300); a gear support (400); and A second planetary gear assembly (500), wherein the first planetary gear assembly (300), the gear support (400) and the second planetary gear assembly (500) are connected in sequence and are all arranged in the speed reduction chamber (201); The isolation plate (110) is sleeved on the second planetary gear assembly (500), the first isolation surface (112) abuts against the gear bracket (400), the second isolation surface (113) abuts against the second planetary gear assembly (500), and the meshing member (120) meshes with the second planetary gear assembly (500).

6. The planetary reducer according to claim 5, characterized in that: The isolation plate (110) is formed with an outer peripheral edge (115), and the outer peripheral edge (115) is spaced apart from the inner wall of the deceleration chamber (201).

7. The planetary reducer according to claim 5, characterized in that: The inner wall of the connecting hole (111) is spaced apart from the second planetary gear assembly (500).

8. The planetary reducer according to claim 5, characterized in that: The first planetary gear assembly (300) comprises a first sun gear (310) and a first planetary gear (320). The first sun gear (310) is arranged in the deceleration chamber (201). A plurality of the first planetary gears (320) are arranged around the first sun gear (310). Each of the first planetary gears (320) is respectively meshed with the first sun gear (310) and the mounting shell (200). Each of the first planetary gears (320) is also fixedly connected to the gear bracket (400).

9. The planetary reducer according to claim 8, characterized in that: The second planetary gear assembly (500) includes a second sun gear (510) and a second planetary gear (520). The second sun gear (510) is disposed in the deceleration chamber (201) and is fixedly connected to the gear bracket (400). A plurality of second planetary gears (520) are disposed around the second sun gear (510). Each of the second planetary gears (520) is respectively meshed with the second sun gear (510) and the mounting shell (200). Each of the second planetary gears (520) is also in contact with the second isolation surface (113).

10. A driving and deceleration integrated device, characterized in that: It comprises a driving motor (10b) and a planetary reducer (10a) as claimed in any one of claims 5 to 9, wherein the mounting shell (200) is connected to the outer shell of the driving motor (10b), and the first planetary gear assembly (300) is sleeved on the power output end of the driving motor (10b).

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