Gear motor structure and transmission structure of motor and transmission box

Abstract

This utility model relates to a geared motor structure and a transmission structure between the motor and the transmission box. It solves the technical problems of existing motor shafts being connected to gear sets in independent gearboxes via couplings or long shafts, and the gear meshing accuracy being significantly affected by assembly errors. It includes a motor housing and a motor body housed within the motor housing. The motor shaft of the motor body is connected to a transmission gear via a planetary gear set. One end of the motor housing has a transmission cylindrical portion, the planetary gear set extending into the transmission cylindrical portion, and the transmission gear being rotatably mounted inside the transmission cylindrical portion via a gear mounting assembly. The outer side of the transmission cylindrical portion away from the motor housing has a transmission notch, through which the outer circumferential direction of the transmission gear is exposed. The advantages are: the transmission gear and the pulley gear mesh precisely through the transmission notch, and the arc-shaped recess on the upper side of the transmission notch matches the outer circumferential direction of the pulley gear, ensuring tightness and stability of the meshing, and reducing energy loss and vibration during transmission.

Description

Technical Field

[0001] This utility model belongs to the field of motor equipment technology, specifically relating to a geared motor structure and a transmission structure between the motor and the transmission box. Background Technology

[0002] Traditional geared motors typically employ a separate design, consisting of the motor body and an external gearbox. The motor shaft is connected to the gear set within the independent gearbox via a coupling or a long shaft. This structure not only requires additional space to accommodate the gearbox but also results in a large overall size due to the long transmission path and dispersed components, making it difficult to meet the demands of miniaturization. Furthermore, the gear meshing accuracy is significantly affected by assembly errors, which can easily lead to excessive or uneven gear meshing clearances, causing vibration and noise during transmission, and even exacerbating gear wear, thus reducing transmission efficiency and service life. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a geared motor structure.

[0004] Another objective of this invention is to address the aforementioned problems by providing a transmission structure for a motor and a transmission box.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a geared motor structure, including a motor housing and a motor body disposed within the motor housing. The motor shaft of the motor body is connected to a transmission gear via a planetary gear set. One end of the motor housing has a vertically arranged transmission cylindrical portion with an inner cavity. The planetary gear set extends into the transmission cylindrical portion, and the transmission gear is rotatably mounted inside the transmission cylindrical portion via a gear mounting assembly. The outer side of the transmission cylindrical portion away from the motor housing has a transmission notch, and the transmission gear is exposed circumferentially outward through the transmission notch. The design of the planetary gear set extending into the transmission cylindrical portion and the transmission gear being exposed through the notch achieves a compact integration of the power transmission path, reduces redundant space between components, clearly shows the transmission direction of motor power from the motor shaft through the planetary gear set to the transmission gear, and the transmission notch design allows the transmission gear to mesh with external structures, realizing power connection between the motor and external components.

[0006] In the aforementioned geared motor structure, one end of the motor housing is open, and this open end is closed by a cover plate. The transmission cylindrical part is located on the outside of the cover plate. This design, where the open end of the motor housing is closed by the cover plate, provides operating space for the installation of internal components such as the motor body, facilitating assembly during production and disassembly for later maintenance. Positioning the transmission cylindrical part on the outside of the cover plate allows the cover plate to not only serve a sealing function but also bear the load-bearing function of the transmission structure, simplifying the overall structure of the motor housing and reducing the use of independent connecting parts.

[0007] In the aforementioned geared motor structure, the transmission cylindrical part and the cover plate are integrated into a single structure. The upper end of the transmission cylindrical part is closed, while the lower end is open. The lower end of the transmission cylindrical part is connected to the inside of the motor housing through a through hole in the cover plate. This integrated structure avoids the loosening problems that can occur with separate connections, improving the structural strength and stability of the transmission components. The connection between the lower end of the transmission cylindrical part and the inside of the motor housing through the through hole allows components such as the planetary gear set to be arranged across different areas, making efficient use of internal space and resulting in a more compact overall structure. The design of the transmission cylindrical part being closed at the upper end and connected at the lower end through the through hole protects the internal gear structure from external dust and other interference without affecting the power transmission of internal components.

[0008] In the aforementioned geared motor structure, the motor body is fixed inside the motor housing by a motor mounting bracket, and a gear housing is coaxially connected to the upper end of the motor body. The planetary gear set is disposed within the gear housing, and the gear housing extends to the inner side of the transmission cylindrical portion. The motor body is fixed inside the housing by the motor mounting bracket, ensuring the stability of the motor during operation and reducing the impact of vibration on transmission accuracy. The gear housing encloses the planetary gear set and extends to the inner side of the transmission cylindrical portion, providing an independent protective space for the planetary gear set and preventing interference with other components within the motor housing.

[0009] In the aforementioned geared motor structure, the transmission gear is connected to a one-way clutch assembly located on the upper end of the gear housing. A Hall plate corresponding to the transmission gear is mounted on one side of the upper end of the gear housing via several snap-fit ​​components. The one-way clutch assembly enables the transmission gear to perform unidirectional transmission, allowing for unidirectional power transmission according to actual needs, thus expanding the application scenarios of the motor. The Hall plate, mounted via snap-fit ​​components, corresponds to the transmission gear, facilitating real-time detection of parameters such as the transmission gear's speed and position, providing hardware support for intelligent motor control. The snap-fit ​​connection also facilitates the installation and replacement of the Hall plate.

[0010] In the aforementioned geared motor structure, the gear mounting assembly includes a mounting cylinder disposed on the inner side of the upper end of the transmission cylindrical portion. The transmission gear has a central hole fitted onto the mounting cylinder, and a bearing is provided between the central hole and the mounting cylinder. The transmission gear is fitted onto the mounting cylinder through the central hole and rotates in conjunction with the bearing, significantly reducing frictional resistance during transmission, improving power transmission efficiency, and reducing component wear. Simultaneously, the mounting cylinder, located on the inner side of the upper end of the transmission cylindrical portion, provides clear axial and radial positioning for the transmission gear, ensuring coaxiality and stability during gear meshing.

[0011] In the aforementioned geared motor structure, the upper center of the transmission cylindrical portion has an upwardly protruding positioning protrusion, and the transmission notch is formed on one side of the upper end of the transmission cylindrical portion, with an arc-shaped recess on the upper side of the transmission notch. The upwardly protruding positioning protrusion can cooperate with external structures to achieve precise positioning and installation of the motor and external equipment, ensuring the meshing accuracy of the transmission gear and the external gear. The arc-shaped recess on the upper side of the transmission notch matches the circumferential outer side of the external gear, ensuring that the transmission gear is exposed for meshing while providing clearance space for the external gear, avoiding structural interference, and improving meshing stability.

[0012] A transmission structure for a motor and a transmission housing includes a transmission housing and a motor housing. The transmission housing contains a pulley gear. One side of the transmission housing has a transmission groove, and one side of the pulley gear extends into the transmission groove. One end of the motor housing has a transmission cylindrical portion that inserts into the transmission groove. The transmission gear within the transmission cylindrical portion protrudes through a transmission notch on one side of the transmission cylindrical portion and meshes with the pulley gear. The transmission cylindrical portion of the motor is directly inserted into the transmission groove of the transmission housing, achieving an integrated connection between the motor and the transmission housing. This reduces intermediate transmission links and lowers power loss. The transmission gear directly meshes with the pulley gear inside the transmission housing through the transmission notch, and the meshing part is confined within the transmission groove, avoiding interference from external factors in the meshing process and improving transmission reliability.

[0013] In the aforementioned motor and transmission box structure, the transmission box has an opening on the side away from the motor housing, and this opening is closed by a transmission box cover. The upper center of the cylindrical transmission section has an upward-protruding positioning protrusion, and the transmission box cover has positioning holes for the positioning protrusion to insert into. The closed transmission box opening facilitates the installation, inspection, and maintenance of components such as pulleys and gears inside the transmission box. The positioning protrusion of the cylindrical transmission section engages with the positioning holes of the transmission box cover, further enhancing the overall positioning accuracy of the motor and transmission box, ensuring the stability of gear meshing during long-term operation, and reducing misalignment problems caused by vibration.

[0014] In the aforementioned motor and transmission box transmission structure, the transmission notch is formed at the upper edge of the transmission cylindrical part. The upper side of the transmission notch has an inwardly recessed arc-shaped portion that matches the circumferential outer side of the pulley gear. This arc-shaped recess matches the circumferential outer side of the pulley gear, ensuring full meshing between the transmission gear and the pulley gear after the transmission cylindrical part is inserted into the transmission slot, while also minimizing the installation gap between them. This also facilitates the installation of the transmission cylindrical part, improving structural compactness. Furthermore, the avoidance design of the arc-shaped recess prevents hard collisions between the gear and the transmission cylindrical part, transmission slot, and other structures during transmission, reducing the risk of component damage.

[0015] Compared with existing technologies, the advantages of this utility model are:

[0016] 1. The transmission gear and the pulley gear of this device mesh precisely through the transmission notch, and the arc-shaped recess on the upper side of the transmission notch matches the outer circumferential direction of the pulley gear, ensuring tightness and stability of meshing and reducing energy loss and vibration during transmission.

[0017] 2. In the gear mounting assembly of this device, the transmission gear is mounted on the mounting cylinder via bearings. The bearings reduce the frictional resistance when the transmission gear rotates, thereby improving transmission efficiency and the service life of the components.

[0018] 3. The motor body of the device is fixed inside the motor housing by the motor mounting bracket. The gear housing is coaxially connected to the motor body, ensuring the coaxiality of the core components. At the same time, the positioning protrusion at the upper end of the transmission cylindrical part cooperates with the positioning hole on the transmission box cover, and the design of the transmission cylindrical part being inserted into the transmission groove realizes the rapid and accurate positioning of the motor and the transmission box, simplifies the assembly process, and reduces assembly errors. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the transmission box in this utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the motor housing and the transmission cylindrical part in this utility model.

[0022] Figure 4 This is a schematic diagram of the transmission cylindrical part in this utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the motor body and gear housing in this utility model.

[0024] Figure 6 This is a structural cross-sectional view of the motor body and gear housing in this utility model.

[0025] Figure 7 This is a schematic diagram of the meshing structure of the pulley gear and the transmission gear in this utility model.

[0026] In the diagram: 1. Motor housing, 11. Transmission cylindrical part, 12. Transmission notch, 13. Cover plate, 14. Through hole, 15. Positioning protrusion, 16. Arc-shaped recess, 2. Motor body, 21. Motor shaft, 22. Motor mounting bracket, 23. Gear housing, 24. Buckle, 25. Hall plate, 3. Planetary gear set, 4. Transmission gear, 5. Gear mounting assembly, 51. Mounting cylinder, 52. Center hole, 53. Bearing, 6. One-way clutch assembly, 7. Transmission housing, 71. Pulley gear, 72. Transmission groove, 73. Transmission housing cover, 74. Positioning hole. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-7 As shown, a geared motor structure includes a motor housing 1 and a motor body 2 disposed within the motor housing 1. The motor shaft 21 of the motor body 2 is connected to a transmission gear 4 via a planetary gear set 3. One end of the motor housing 1 has a vertically arranged transmission cylindrical portion 11 with an inner cavity. The planetary gear set 3 extends into the transmission cylindrical portion 11, and the transmission gear 4 is rotatably disposed inside the transmission cylindrical portion 11 via a gear mounting assembly 5. The outer side of the transmission cylindrical portion 11 away from the motor housing 1 has a transmission notch 12, and the transmission gear 4 is exposed circumferentially outward through the transmission notch 12. The design of the planetary gear set 3 extending into the transmission cylindrical portion 11 and the transmission gear 4 being exposed through the notch achieves a compact integration of the power transmission path, reduces redundant space between components, and clearly shows the transmission direction of motor power from the motor shaft 21 through the planetary gear set 11 to the transmission gear 4. Furthermore, the design of the transmission notch 12 allows the transmission gear 4 to mesh with an external structure, realizing the power connection between the motor and external components.

[0029] like Figure 3 As shown, one end of the motor housing 1 is open, and the open end of the motor housing 1 is closed by a cover plate 13, with the transmission cylindrical part 11 located on the outside of the cover plate 13. The design of closing the open end of the motor housing 1 with the cover plate 13 provides operating space for the installation of internal components such as the motor body 2, facilitating assembly during production and disassembly during later maintenance. By placing the transmission cylindrical part 11 on the outside of the cover plate 13, the cover plate 13 not only serves a sealing function but also bears the load-bearing function of the transmission structure, simplifying the overall structure of the motor housing 1 and reducing the use of independent connecting parts.

[0030] Combination Figure 3 and Figure 4As shown, the transmission cylindrical part 11 and the cover plate 13 are integrated into one structure. The upper end of the transmission cylindrical part 11 is closed and the lower end is open. The lower end of the transmission cylindrical part 11 is connected to the inside of the motor housing 1 through a through hole 14 provided on the cover plate 13. The integrated structure of the transmission cylindrical part 11 and the cover plate 13 avoids the loosening problem that may occur with separate connections, and improves the structural strength and stability of the transmission part. The lower end of the transmission cylindrical part 11 is connected to the inside of the motor housing 1 through the through hole 14, which allows components such as the planetary gear set 11 to be arranged across regions, making reasonable use of the internal space and making the overall structure more compact. The design of the transmission cylindrical part 11 being closed at the upper end and connected at the lower end through the through hole 14 can protect the internal gear structure from external dust and other interference without affecting the power transmission of the internal components.

[0031] Combination Figure 5 and Figure 6 As shown, the motor body 2 is fixed inside the motor housing 1 by the motor mounting bracket 22, and a gear housing 23 is coaxially connected to the upper end of the motor body 2. The planetary gear set 3 is disposed inside the gear housing 23, and the gear housing 23 extends to the inner side of the transmission cylindrical part 11. The motor body 2 is fixed inside the housing by the motor mounting bracket 22 to ensure the stability of the motor during operation and reduce the impact of vibration on the transmission accuracy. The gear housing 23 encloses the planetary gear set 3 and extends to the inner side of the transmission cylindrical part 11, providing an independent protective space for the planetary gear set 3 and preventing it from interfering with other components inside the motor housing 1.

[0032] The transmission gear 4 is connected to a one-way clutch assembly 6 located on the upper end of the gear housing 23. A Hall plate 25 corresponding to the transmission gear 4 is provided on one side of the upper end of the gear housing 23 via several snap-fit ​​components 24. The one-way clutch assembly 6 enables the transmission gear 4 to have a one-way transmission function, allowing for unidirectional power transmission according to actual needs, thus expanding the application scenarios of the motor. The Hall plate 25, installed via the snap-fit ​​components 34, corresponds to the transmission gear 4, facilitating real-time detection of parameters such as the speed and position of the transmission gear 4, providing hardware support for intelligent motor control. The snap-fit ​​connection method also facilitates the installation and replacement of the Hall plate 25.

[0033] Combination Figures 4-6 As shown, the gear mounting assembly 5 includes a mounting cylinder 51 disposed on the inner side of the upper end of the transmission cylindrical portion 11. The transmission gear 4 has a central hole 52 fitted onto the mounting cylinder 51, and a bearing 53 is provided between the central hole 52 and the mounting cylinder 51. The transmission gear 4 is fitted onto the mounting cylinder 51 through the central hole 52 and rotates in conjunction with the bearing 53, which significantly reduces frictional resistance during transmission, improves power transmission efficiency, and reduces component wear. At the same time, the mounting cylinder 51, disposed on the inner side of the upper end of the transmission cylindrical portion 11, provides clear axial and radial positioning for the transmission gear 4, ensuring coaxiality and stability during gear meshing.

[0034] Combination Figure 3 and Figure 4 As shown, the upper center of the transmission cylindrical part 11 has an upwardly protruding positioning protrusion 15, and a transmission notch 12 is formed on one side of the upper end of the transmission cylindrical part 11, with an arc-shaped recess 16 on the upper side of the transmission notch 12. The upwardly protruding positioning protrusion 15 can cooperate with external structures to achieve precise positioning and installation of the motor and external equipment, ensuring the meshing accuracy of the transmission gear 4 and the external gear. The arc-shaped recess 16 on the upper side of the transmission notch 12 matches the outer circumferential direction of the external gear, ensuring that the transmission gear 4 is exposed for meshing while providing clearance space for the external gear, avoiding structural interference, and improving meshing stability.

[0035] Combination Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, a transmission structure for a motor and a transmission housing includes a transmission housing 7 and a motor housing 1. The transmission housing 7 has a pulley gear 71 inside. One side of the transmission housing 7 has a transmission groove 72, and one side of the pulley gear 71 extends into the transmission groove 72. One end of the motor housing 1 has a transmission cylindrical portion 11 that inserts into the transmission groove 72. A transmission gear 4 inside the transmission cylindrical portion 11 protrudes through a transmission notch 12 on one side of the transmission cylindrical portion 11 and meshes with the pulley gear 71. The transmission cylindrical portion 11 of the motor is directly inserted into the transmission groove 72 of the transmission housing 7, achieving an integrated connection between the motor and the transmission housing 7. This reduces intermediate transmission links and lowers power loss. The transmission gear 4 directly meshes with the pulley gear 71 inside the transmission housing 7 through the transmission notch 12. The meshing part is confined within the transmission groove 72, avoiding interference from external factors in the meshing process and improving transmission reliability.

[0036] The transmission housing 7 has an opening on the side away from the motor housing 1, which is closed by a transmission housing cover 73. The upper center of the transmission cylindrical part 11 has an upwardly protruding positioning protrusion 15, and the transmission housing cover 73 has a positioning hole 74 for the positioning protrusion 15 to be inserted. The opening is closed by the transmission housing cover 73, facilitating the installation, inspection, and maintenance of components such as the pulley gear 71 inside the transmission housing 7. The positioning protrusion 15 of the transmission cylindrical part 11 engages with the positioning hole 74 of the transmission housing cover 73, further enhancing the overall positioning accuracy of the motor and transmission housing, ensuring the stability of gear meshing during long-term operation, and reducing misalignment problems caused by vibration.

[0037] Specifically, the transmission notch 12 is formed on the upper edge of the transmission cylindrical portion 11, and the upper side of the transmission notch 12 has an arc-shaped recess 16 that matches the circumferentially outward of the pulley gear 71 and is recessed inward. The arc-shaped recess 16 matches the circumferentially outward of the pulley gear 71, so that after the transmission cylindrical portion 11 is inserted into the transmission groove 72, it can ensure the full meshing of the transmission gear 4 and the pulley gear 71, and minimize the installation gap between the two. It is also conducive to the installation of the transmission cylindrical portion 11 and improves the structural compactness. At the same time, the avoidance design of the arc-shaped recess 16 avoids hard collisions between the gear and the transmission cylindrical portion 11, transmission groove 72 and other structures during transmission, reducing the risk of component damage.

[0038] The principle of this embodiment is as follows:

[0039] After the motor body 2 is powered on, the motor shaft 21 begins to rotate, transmitting power to the planetary gear set 3 connected to it. The planetary gear set 3 achieves speed reduction and torque increase through gear meshing and transmits power to the transmission gear 4. The transmission gear 4 is connected to the one-way clutch assembly 6 at the upper end of the gear housing 23, so that the transmission gear 4 can only transmit power in a specific direction, realizing the one-way restriction of power transmission and protecting the motor from damage by reverse torque. The Hall plate 25 on the gear housing 23 corresponds to the transmission gear 4. By detecting parameters such as the speed and position of the transmission gear 4, it provides real-time feedback on the operating status of the motor and provides data support for the intelligent control of the motor. The transmission cylindrical part 11 of the motor is inserted into the transmission groove 72 of the transmission housing 7. The transmission gear 4 protrudes from the transmission notch 12 and meshes with the pulley gear 71 inside the transmission housing 7. The power output by the motor is transmitted to the pulley gear 71 through the transmission gear 4, thereby driving other components inside the transmission housing 7 and realizing the power connection between the motor and external equipment.

[0040] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0041] Although this document frequently uses terms such as motor housing 1, transmission cylindrical part 11, transmission notch 12, cover plate 13, through hole 14, positioning protrusion 15, arc-shaped recess 16, motor body 2, motor shaft 21, motor mounting bracket 22, gear housing 23, fastener 24, Hall plate 25, planetary gear set 3, transmission gear 4, gear mounting assembly 5, mounting cylinder 51, center hole 52, bearing 53, one-way clutch assembly 6, transmission housing 7, pulley gear 71, transmission groove 72, transmission housing cover 73, and positioning hole 74, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A geared motor structure, comprising a motor housing (1) and a motor body (2) disposed within the motor housing (1), wherein the motor shaft (21) of the motor body (2) is connected to a transmission gear (4) via a planetary gear set (3), characterized in that, The motor housing (1) has a vertically arranged transmission cylindrical part (11) with an inner cavity at one end. The planetary gear set (3) extends into the transmission cylindrical part (11) and the transmission gear (4) is rotatably disposed inside the transmission cylindrical part (11) through the gear mounting assembly (5). The transmission cylindrical part (11) has a transmission notch (12) on the outer side of the end away from the motor housing (1) and the transmission gear (4) is exposed from the transmission notch (12) on the outer side of the circumference.

2. A motor structure with a gear according to claim 1, characterized in that, The motor housing (1) is open at one end, and the open end of the motor housing (1) is closed by a cover plate (13), and the transmission cylindrical part (11) is located on the outside of the cover plate (13).

3. A geared motor structure according to claim 2, wherein The transmission cylindrical part (11) and the cover plate (13) are integrated into one structure. The upper end of the transmission cylindrical part (11) is closed and the lower end is open. The lower end of the transmission cylindrical part (11) is connected to the inside of the motor housing (1) through the through hole (14) provided on the cover plate (13).

4. A geared motor structure according to claim 1 or 2 or 3, characterized in that, The motor body (2) is fixed inside the motor housing (1) by the motor mounting bracket (22), and the upper end of the motor body (2) is coaxially connected to the gear housing (23), and the planetary gear set (3) is set inside the gear housing (23), and the gear housing (23) extends to the inside of the transmission cylindrical part (11).

5. A geared motor structure according to claim 4, wherein The transmission gear (4) is connected to the one-way clutch assembly (6) located on the upper end of the gear housing (23), and a Hall plate (25) corresponding to the transmission gear (4) is provided on one side of the upper end of the gear housing (23) through several fasteners (24).

6. A motor structure with a gear according to claim 1, characterized in that, The gear mounting assembly (5) includes a mounting cylinder (51) disposed on the inner side of the upper end of the transmission cylindrical part (11). The transmission gear (4) has a center hole (52) sleeved on the mounting cylinder (51), and a bearing (53) is provided between the center hole (52) and the mounting cylinder (51).

7. The geared motor structure according to claim 1, characterized in that, The transmission cylindrical part (11) has an upwardly protruding positioning protrusion (15) at the center of its upper end, and the transmission notch (12) is formed on one side of the upper end of the transmission cylindrical part (11) and the upper side of the transmission notch (12) has an arc-shaped recess (16).

8. A transmission structure for a motor and a transmission housing, comprising the geared motor structure as described in any one of claims 1-7, including a transmission housing (7) and a motor housing (1), wherein the transmission housing (7) has a pulley gear (71) inside, characterized in that, The transmission housing (7) has a transmission groove (72) on one side and the pulley gear (71) extends into the transmission groove (72) on one side. The motor housing (1) has a transmission cylindrical part (11) inserted into the transmission groove (72) at one end. The transmission gear (4) in the transmission cylindrical part (11) is exposed through the transmission notch (12) on one side of the transmission cylindrical part (11) and meshes with the pulley gear (71).

9. The transmission structure of the motor and transmission box according to claim 8, characterized in that, The transmission housing (7) has a transmission housing opening on the side away from the motor housing (1) and the transmission housing opening is closed by the transmission housing cover (73). The upper center of the transmission cylindrical part (11) has an upwardly protruding positioning protrusion (15), and the transmission housing cover (73) is provided with a positioning hole (74) for the positioning protrusion (15) to be inserted.

10. The transmission structure of the motor and transmission box according to claim 8, characterized in that, The transmission notch (12) is formed on the upper edge of the transmission cylindrical part (11), and the upper side of the transmission notch (12) has an arc-shaped recess (16) that matches the outer circumferential direction of the pulley gear (71) and is recessed inward.

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