A motor assembly used in smart locks

Abstract

The present invention discloses a motor assembly applied to a smart lock, comprising a shell, a motor, a reduction mechanism, an output shaft and a clutch mechanism, the motor is arranged on one side of the shell, the rotating shaft at the front end of the motor extends into the shell, the reduction mechanism is arranged in the shell, the reduction mechanism comprises a worm, a plurality of transmission gear assemblies and an output gear, the worm is connected to the rotating shaft of the motor, the transmission gear assembly arranged near the worm is meshed with the worm, adjacent transmission gear assemblies are meshed with each other, the transmission gear assembly arranged near the output gear is meshed with the output gear, a plurality of transmission gear assemblies and the output gear approach the rear end of the motor in sequence, the output shaft is connected with the output gear, the clutch mechanism is arranged between the output gear and the output shaft, when the motor loses power, the clutch mechanism separates the output shaft from the output gear; compared with the prior art, the motor assembly applied to the smart lock of the present invention has a compact structure, a small volume, a large torque, and has two functions of manual unlocking and automatic unlocking.

Description

Technical Field

[0001] The present invention relates to the technical field of smart locks, and in particular to a motor assembly applied to a smart lock. Background Art

[0002] The motor assembly of a smart lock generally includes a drive motor, a reduction mechanism and an output shaft. In order to obtain a larger reduction ratio for the output shaft, the reduction mechanism adopts a multi-stage reduction transmission; multiple transmission gears are arranged in sequence from the output end of the motor to the direction away from the motor; when a multi-stage reduction transmission is set to obtain a larger reduction ratio, multiple transmission gears will increase the volume of the motor assembly of the smart lock, or increase the thickness of the motor assembly. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the prior art and provide a motor assembly applied to a smart lock, comprising a shell, a motor, a reduction mechanism, an output shaft and a clutch mechanism. The motor is arranged on one side of the shell, and the rotating shaft at the front end of the motor extends into the shell. The reduction mechanism is arranged in the shell. The reduction mechanism comprises a worm, multiple transmission gear assemblies and an output gear. The worm is connected to the rotating shaft of the motor, and the transmission gear assembly arranged near the worm is meshed with the worm. Adjacent transmission gear assemblies are meshed with each other. The transmission gear assembly arranged near the output gear is meshed with the output gear. Multiple transmission gear assemblies and the output gear approach the rear end of the motor in sequence, and the output shaft is connected to the output gear. The upper and lower ends of the output shaft extend from the upper and lower surfaces of the shell respectively. The clutch mechanism is arranged between the output gear and the output shaft. When the motor loses power, the clutch mechanism separates the output shaft from the output gear, so that the output shaft is manually rotated to unlock.

[0004] According to one embodiment of the present invention, an upper shaft seat is provided on the inner wall of the upper shell, a lower shaft seat corresponding to the upper shaft seat is provided on the inner wall of the lower shell, and the rotating shaft is placed between the upper shaft seat and the lower shaft seat.

[0005] According to one embodiment of the present invention, the upper housing is provided with a locating bearing, the lower housing is provided with an output bearing, the upper end of the output shaft extends from the locating bearing, and the lower end of the output shaft extends from the output bearing.

[0006] According to one embodiment of the present invention, the transmission gear assembly includes a rotating shaft, a large gear and a small gear, the rotating shaft is arranged in a housing, the large gear and the small gear are arranged on the rotating shaft, the large gear of the transmission gear assembly arranged near the worm is meshed with the worm; among two adjacent transmission gear assemblies, the small gear of the transmission gear assembly near the front end of the motor is meshed with the large gear of the transmission gear assembly near the rear end of the motor; the small gear of the transmission gear assembly arranged near the output gear is meshed with the output gear.

[0007] According to an embodiment of the present invention, the gear meshing with the worm is a plastic gear.

[0008] According to an embodiment of the present invention, the gear teeth thickness of the plastic gear meshing with the worm is greater than the gear teeth thickness of other gears of the transmission gear assembly, and the thickness of the helical teeth of the worm is less than the gear teeth thickness of the plastic gear.

[0009] According to one embodiment of the present invention, the shell includes an upper shell and a lower shell, which are tightly closed into a closed space by screws, and the reduction mechanism is placed in the closed space. The upper end of the output shaft extends from the upper shell, and the lower end of the output shaft extends from the lower shell.

[0010] According to one embodiment of the present invention, the clutch mechanism includes a pin groove, a limit pin and a spring, the pin groove is arranged on the upper surface of the output gear, the limit pin is arranged on the output shaft, the spring is sleeved on the output shaft, and the spring is arranged between the output gear and the housing. The part of the output shaft extending out of the housing is pressed to make the limit pin leave the pin groove, so that the output shaft is free relative to the output gear; at the same time, the spring is compressed between the limit pin and the housing; after the force on the part of the output shaft extending out of the housing disappears, the spring stretches and drives the limit pin to reset.

[0011] According to one embodiment of the present invention, the output shaft includes an output part, a limiting part and a positioning part, which are connected in sequence from bottom to top, the output part extends from the bottom of the shell through the output gear, and the positioning part extends from the top of the shell. The spring is a tower-shaped spring, and the spring is sleeved on the limiting part and is located between the output limiting pin and the bottom of the positioning bearing.

[0012] According to one embodiment of the present invention, a gasket is provided on the output shaft, the gasket is located above the limiting pin, and the spring is provided between the gasket and the housing.

[0013] Compared with the prior art, the motor assembly applied to the smart lock of the present invention has the following advantages:

[0014] The motor assembly of the present invention applied to the smart lock comprises a reduction mechanism including a worm, a reduction mechanism and an output gear. The reduction mechanism comprises a worm, multiple transmission gear assemblies and an output gear. The worm is connected to the motor shaft, and the transmission gear assembly arranged close to the worm meshes with the worm to convert the vertical rotation of the motor shaft into the horizontal rotation of the reduction mechanism, thereby reducing the thickness of the motor assembly; the transmission gear assembly and the output gear are successively approached to the rear end of the motor to reduce the width and length of the motor assembly; adjacent transmission gear assemblies mesh with each other, and the transmission gear assembly arranged close to the output gear meshes with the output gear, and a multi-stage reduction transmission is used to ensure a larger output torque; a clutch mechanism is provided between the output gear and the output shaft. When the motor loses power, the clutch mechanism separates the output shaft from the output gear, thereby realizing manual rotation of the output shaft to unlock. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the motor assembly applied to the smart lock of the present invention;

[0016] Figure 2 for Figure 1 A schematic diagram of the structure in another direction;

[0017] Figure 3 for Figure 1 Schematic diagram of the structure after removing the shell;

[0018] Figure 4 for Figure 3 A schematic diagram of the structure in another direction;

[0019] Figure 5 It is a structural schematic diagram of the upper shell;

[0020] Figure 6 is a schematic diagram of the structure of the lower shell;

[0021] Figure 7 for Figure 3 Schematic diagram of the structure after removing the motor and reduction mechanism;

[0022] Figure 8 for Figure 7 The structural diagram of the output gear;

[0023] Fig. 9 for Figure 7 Schematic diagram of the structure of the output shaft;

[0024] In the figure: 1. housing, 11. upper housing, 111. positioning bearing, 112. first upper shaft seat, 113. second upper shaft seat, 114. third upper shaft seat, 12. lower housing, 121. output bearing, 122. first lower shaft seat, 123. second lower shaft seat, 124. third lower shaft seat, 2. motor, 3. speed reduction mechanism, 31. worm, 32. first transmission gear assembly, 321. first rotating shaft, 322. first large gear, 323. .First pinion, 33.Second transmission gear assembly, 331.Second rotating shaft, 332.Second large gear, 333.Second pinion, 34.Third transmission gear assembly, 341.Third rotating shaft, 342.Third large gear, 343.Third pinion, 35.Output gear, 351.Pin groove, 4.Output shaft, 41.Output part, 42.Limiting part, 43.Locking part, 44.Limiting pin, 45.Spring, 46.Gasket

[0025] The realization of the functions and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include multiple such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0030] See also Figures 1 to 3 , Figure 1 It is a structural schematic diagram of the motor assembly applied to the smart lock of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure in another direction; Figure 3 for Figure 1Schematic diagram of the structure after removing the shell; as shown in the figure, the motor assembly used in the smart lock includes a shell 1, a motor 2, a reduction mechanism 3, an output shaft 4 and a clutch mechanism, the shell 1 includes an upper shell 11 and a lower shell 12, the upper shell 11 and the lower shell 12 are screwed together to form a closed space, the motor 2 is arranged on one side of the shell 1, the rotating shaft at the front end of the motor 2 extends into the shell 1, the reduction mechanism 3 is placed in the closed space, the reduction mechanism 3 includes a worm 31, a first transmission gear assembly 32, a second transmission gear assembly 33, a third transmission gear assembly 34 and an output shaft 4. The gear 35 and the worm 31 are connected to the rotating shaft of the motor 2 extending into the housing 1, the worm 31 is meshed with the first transmission gear assembly 32, the first transmission gear assembly 32 is meshed with the second transmission gear assembly 33, the second transmission gear assembly 33 is meshed with the third transmission gear assembly 34, and the third transmission gear assembly 34 is meshed with the output gear 35. The multi-stage reduction transmission can make the motor 2 output a larger torque; the second transmission gear assembly 22, the third transmission gear assembly 34 and the output gear 35 are successively close to the rear end of the motor 2, the first transmission gear assembly 32 is close to the front of the motor 2, the second transmission gear assembly 33, the third transmission gear assembly 34 and the output gear 35 are close to the rear of the motor 2, the distance between the second transmission gear assembly 33 and the rear end of the motor 2 is greater than the distance between the third transmission gear assembly 34 and the rear of the motor 2, the distance between the third transmission gear assembly 34 and the rear of the motor 2 is greater than the distance between the output gear 35 and the rear of the motor 2, the output gear 35 is close to the rear of the motor 2, and the distance between the center of the output gear 35 and the motor 2 is less than the distance between the third transmission gear and the motor 2 in the longitudinal direction; so that the overall length of the motor 2 The dimensions in the vertical and height directions are reduced; the output shaft 4 is connected to the output gear 35, the upper end of the output shaft 4 extends from the upper shell 11, and the lower end of the output shaft 4 extends from the lower shell 12; the rotating shaft of the motor 2 drives the worm 31 to rotate, and the worm 31 converts the vertical rotation of the rotating shaft of the motor 2 into the horizontal rotation of the first transmission gear assembly 32, which can reduce the thickness of the motor 2 assembly. The clutch mechanism is arranged between the output gear 35 and the output shaft 4. When the motor 2 loses power, the clutch mechanism separates the output shaft 4 from the output gear 35, so that the output shaft can be manually rotated to unlock.

[0031] Please review Figure 1 , Figure 2In this embodiment, the shell 1 is L-shaped, the transversely arranged part of the shell 1 is away from the upper part of the longitudinally arranged part of the shell 1 and is empty, the motor 2 is horizontally arranged above the transversely arranged part of the shell 1, the rotating shaft of the motor 2 extends into the longitudinally arranged part of the shell 1, the first transmission gear assembly 32 is arranged in the longitudinally arranged part of the shell 1, the second transmission gear assembly 33 is arranged at the junction of the longitudinally arranged part and the transversely arranged part of the shell 1, the third transmission gear assembly 34 and the output gear 35 are arranged in the transversely arranged part of the shell 1; the length of the transversely arranged part of the shell 1 is the distance between the rear end of the motor 2 and the front end of the rotating shaft of the motor 2, the height of the longitudinally arranged part of the shell 1 is adapted to the distance from the upper part of the motor 2 to the lower part of the third transmission gear assembly 34, the overall structure is compact, so that the size of the motor 2 assembly applied to the smart lock of this embodiment is minimized.

[0032] like Figure 4 As shown, Figure 4 for Figure 3 A structural schematic diagram of another direction, the first transmission gear assembly 32 includes a first rotating shaft 321, a first large gear 322 and a first small gear 323, the first rotating shaft 321 is arranged in the shell 1, the first large gear 322 and the first small gear 323 are arranged on the first rotating shaft 321, the first large gear 322 is located above the first small gear 323, the first large gear 322 is meshed with the worm 31, the first large gear 322 rotates around the first rotating shaft 321 with the worm 31 and changes the direction of the rotating shaft of the motor 2, and the first large gear 322 rotates while driving the first small gear 323 to rotate. When the rotation angle is the same, the rotation arc of the first small gear 323 becomes smaller, thereby realizing the first stage reduction transmission.

[0033] In this embodiment, the first large gear 322 is a plastic gear; the worm 31 is made of metal material, and the first large gear 322 is made of plastic material, which can reduce noise during the rotation process.

[0034] In this embodiment, since the first large gear 322 is a plastic gear, in order to enhance the strength of the gear teeth of the first large gear 322, the gear tooth thickness of the first large gear 322 is greater than the gear tooth thickness of other transmission gear assemblies. In order to achieve a constant transmission stroke of the worm 31 when the length of the worm 31 remains unchanged, the thickness of the helical teeth of the worm 31 is less than the gear tooth thickness of the first large gear 322.

[0035] Please review Figure 4The second transmission gear assembly 33 includes a second rotating shaft 331, a second large gear 332 and a second small gear 333. The second rotating shaft 331 is arranged in the housing 1, and the second large gear 332 and the second small gear 333 are arranged on the second rotating shaft 331. The second large gear 332 is located below the second small gear 333, and the second large gear 332 is meshed with the first small gear 323. The second large gear 332 rotates around the second rotating shaft 331 driven by the first small gear 323, and at the same time drives the second small gear 333 to rotate. When the rotation angle is the same, the rotation arc of the second small gear 333 becomes smaller, thereby realizing the second stage reduction transmission.

[0036] Please review Figure 4 The third transmission gear assembly 34 includes a third rotating shaft 341, a third large gear 342 and a third small gear 343. The third rotating shaft 341 is arranged in the housing 1, and the third large gear 342 and the third small gear 343 are arranged on the third rotating shaft 341. The third large gear 342 is located below the third small gear 343. The third large gear 342 is meshed with the second small gear 333. The third large gear 342 rotates around the third rotating shaft 341 driven by the second small gear 333 and drives the third small gear 343 to rotate. When the rotation angle is the same, the rotation arc of the third small gear 343 becomes smaller, thereby realizing the third stage reduction transmission; the third small gear 343 is meshed with the output gear 35. The outer diameter of the third small gear 343 is smaller than the outer diameter of the output gear 35. When the rotation arc is the same, the rotation angle of the output gear 35 is smaller than the rotation angle of the third small gear 343, thereby realizing the fourth stage reduction transmission.

[0037] In this embodiment, the outer diameters of the first large gear 322, the second large gear 332, the third large gear 342 and the output gear 35 gradually increase, and the outer diameters of the first small gear 323, the second small gear 333 and the third small gear 343 gradually increase to ensure the output torque of the motor.

[0038] Please review Figure 1 , Figure 2 The upper shell 11 is provided with a locating bearing 111, the lower shell 12 is provided with an output bearing 121, the upper end of the output shaft 4 extends from the locating bearing 111, and the lower end of the output shaft 4 extends from the output bearing 121; when the reduction mechanism 3 drives the output shaft 4 to rotate, the output shaft 4 rotates around the locating bearing 111 and the output bearing 121; the friction between the output shaft 4 and the shell 1 can be reduced.

[0039] like Figure 5 , Figure 6 As shown, Figure 5 It is a structural schematic diagram of the upper shell; Figure 6It is a schematic structural diagram of the lower shell; the inner wall of the upper shell 11 is provided with a first upper shaft seat 112, a second upper shaft 113 and a third upper shaft seat 114, the inner wall of the lower shell 12 is provided with a first lower shaft seat 122, a second lower shaft seat 123 and a third lower shaft seat 124 corresponding to the first upper shaft seat 112, the second upper shaft seat 113 and the third upper shaft seat 114 respectively, the first rotating shaft 321 is placed between the first upper shaft seat 112 and the first lower shaft seat 122, the second rotating shaft 331 is placed between the second upper shaft seat 113 and the second lower shaft seat 123, and the third rotating shaft 341 is placed between the third upper shaft seat 114 and the third lower shaft seat 124.

[0040] like Figures 7 to 9 As shown, Figure 7 for Figure 3 Schematic diagram of the structure after removing the motor and reduction mechanism; Figure 8 for Figure 7 The structural diagram of the output gear; Fig. 9 for Figure 7 Schematic diagram of the structure of the output shaft; in this embodiment, the clutch mechanism includes a pin groove 351, a limit pin 44 and a spring 45. The pin groove 351 is arranged on the upper surface of the output gear 35, and the limit pin 44 is arranged on the output shaft 4. When the motor 2 is powered on, the limit pin 44 is placed in the pin groove 351. When the output gear 35 rotates, due to the limitation of the pin groove 351, the output shaft 4 rotates with the output gear 35. The spring 45 is sleeved on the output shaft 4 and is located between the output gear 35 and the positioning bearing 111. When the motor 2 loses power, the limit pin 44 can be disengaged by pressing the part of the output shaft 4 extending out of the output bearing 121. The overhead slot 351 makes the output shaft 4 free relative to the output gear 35. At this time, the output shaft 4 can be manually rotated with a key to unlock. When the part of the output shaft 4 extending out of the bearing is pressed, the limit pin 44 extends toward the upper surface of the housing 1 along with the output shaft 4. Due to the limitation of the locating bearing 111, the spring 45 is compressed between the limit pin 44 and the locating bearing 111. After unlocking, stop pressing the part of the output shaft 4 extending out of the lower part of the housing 1 and rotate the output shaft 4 at the same time. When the limit pin 44 is aligned with the pin slot 351, the spring 45 extends and drives the limit pin 44 to reset, so that the output shaft 4 is connected to the output gear 35 again.

[0041] Please review, 7. Fig. 9In this embodiment, the output shaft 4 includes an output portion 41, a limiting portion 42 and a positioning portion 43, which are sequentially connected from bottom to top. The output portion 41 passes through the output gear 35 and extends from the output bearing 121. When the output gear 35 rotates, the output portion 41 rotates the output gear 35. The outer diameter of the output portion 41 is matched with the inner diameter of the output bearing 121. When the motor 2 loses power, the output portion 41 is pressed to move upward relative to the lower housing 12. The connecting end of the limiting portion 42 and the output portion 41 is tapered, the outer diameter of the tapered portion close to the output portion 41 is larger than the outer diameter of the output portion 41, and the tapered portion away from the output portion 41 is tapered. The outer diameter of the output part 41 is larger than the outer diameter of the cone close to the output part 41, and the outer diameter of the limit part 42 is smaller than the outer diameter of the positioning part 43. When the smart lock is normally powered on, the positioning part 43 is placed in the positioning bearing 111 and extends from above the positioning bearing 111, and the limit part 42 is located between the output bearing 121 and the positioning bearing 111; when the motor 2 loses power, the output part 41 is pressed, and the limit part 42 can move upward along the positioning bearing 111; the spring 45 is a conical spring 45 adapted to the limit part 42, and the spring 45 is sleeved on the limit part 42 and is located between the output limit pin 44 and the bottom of the positioning bearing 111, which can save space and realize the clutch effect in a smaller space.

[0042] Please review Figure 7 In this embodiment, a gasket 46 is provided on the output shaft 4, and the gasket 46 is located above the limit pin 44. The spring 45 is provided between the gasket 46 and the positioning bearing 111. When the output shaft 4 is pressed, the limit pin 44 pushes the gasket 46 to move, and the gasket 46 compresses the spring 45 upward; when the pressure on the output shaft 4 stops, the spring 45 stretches and pushes the gasket 46 to move downward along the output shaft 4, and the gasket 46 pushes the limit pin 44 to move downward to drive the output shaft 4 to reset.

[0043] The motor assembly of the present invention applied to the smart lock, the first large gear 322 is meshed with the worm 31, the vertical rotation of the shaft of the motor 2 is converted into the horizontal transmission of the first large gear 322, and the thickness of the motor assembly can be reduced; the first transmission gear assembly 32 is meshed with the second transmission gear assembly 33, the second transmission gear assembly 33 is meshed with the third transmission gear assembly 34, the third transmission gear assembly 34 is meshed with the output gear 35, and the multi-stage reduction transmission can make the motor 2 output a larger torque, the first transmission gear assembly 32 is close to the front of the motor 2, the second transmission gear assembly 33, the third transmission gear assembly and the output gear 35 are close to the rear of the motor 2, and the distance between the second transmission gear assembly 33 and the rear end of the motor 2 is greater than that of the third transmission gear assembly 3 4 is at a distance from the rear of the motor 2, the distance from the third transmission gear assembly to the rear of the motor 2 is greater than the distance from the output gear 35 to the rear of the motor 2, the output gear 35 is close to the rear of the motor 2, and the distance from the center of the output gear 35 to the motor 2 is less than the distance from the third transmission gear to the motor 2 in the longitudinal direction; the dimensions of the motor 2 assembly in the length and height directions are reduced; the first large gear 322 is a plastic gear, which can reduce the noise during the transmission process; the clutch mechanism is arranged between the output gear 35 and the output shaft 4, and when the motor 2 loses power, the clutch mechanism separates the output shaft 4 from the output gear 35, so that the output shaft can be manually rotated to unlock; the motor assembly of the present invention applied to the smart lock has the advantages of small size, large torque, low noise and manual unlocking when the motor 2 loses power.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor assembly applied to a smart lock, characterized in that: It includes a housing, a motor, a reduction mechanism, an output shaft and a clutch mechanism, wherein the motor is arranged at one side of the housing, and the rotating shaft at the front end of the motor extends into the housing, the reduction mechanism is arranged in the housing, and the reduction mechanism includes a worm, a plurality of transmission gear assemblies and an output gear, the worm is connected to the rotating shaft of the motor, the transmission gear assembly arranged near the worm is meshed with the worm, adjacent transmission gear assemblies are meshed with each other, the transmission gear assembly arranged near the output gear is meshed with the output gear, a plurality of the transmission gear assemblies and the output gear are approached to the rear end of the motor in sequence, the output shaft is connected to the output gear, the upper and lower ends of the output shaft extend from the upper surface and the lower surface of the housing respectively, and the clutch mechanism is arranged between the output gear and the output shaft; The clutch mechanism comprises a pin slot, a limit pin and a spring, wherein the pin slot is arranged on the upper surface of the output gear, the limit pin is arranged on the output shaft, the spring is sleeved on the output shaft, and the spring is arranged between the output gear and the housing; The output shaft comprises an output part, a limiting part and a positioning part, which are connected in sequence from bottom to top, the output part passes through the output gear and extends from the bottom of the housing, and the positioning part extends from the top of the housing, the spring is a tower-shaped spring, and the spring is sleeved on the limiting part and is located between the limiting pin and the bottom of the positioning bearing; When the motor loses power, the output part is pressed, and the limit part moves upward along the positioning bearing, so that the limit pin leaves the pin groove, and the spring is compressed between the limit pin and the housing, and the output shaft is free relative to the output gear, so that the output shaft can be manually rotated to unlock; stop pressing the output part and rotate the output shaft at the same time, the spring stretches and drives the limit pin to reset, and the output shaft is connected to the output gear again.

2. The motor assembly for smart lock according to claim 1 is characterized in that: A gasket is arranged on the output shaft, the gasket is located above the limiting pin, and the spring is arranged between the gasket and the housing.

3. The motor assembly for smart lock according to claim 1 is characterized in that: The transmission gear assembly includes a rotating shaft, a large gear and a small gear. The rotating shaft is arranged in a shell, and the large gear and the small gear are arranged on the rotating shaft. The large gear of the transmission gear assembly arranged near the worm is meshed with the worm; among two adjacent transmission gear assemblies, the small gear of the transmission gear assembly near the front end of the motor is meshed with the large gear of the transmission gear assembly near the rear end of the motor; the small gear of the transmission gear assembly arranged near the output gear is meshed with the output gear.

4. The motor assembly for smart lock according to claim 3 is characterized in that: The gear meshing with the worm is a plastic gear.

5. The motor assembly for smart lock according to claim 4 is characterized in that: The gear teeth thickness of the plastic gear meshing with the worm is greater than the gear teeth thickness of other gears of the transmission gear assembly, and the thickness of the helical teeth of the worm is less than the gear teeth thickness of the plastic gear.

6. The motor assembly for smart lock according to claim 3 is characterized in that: The housing comprises an upper housing and a lower housing, the upper housing and the lower housing are screwed together to form a closed space, the reduction mechanism is placed in the closed space, the upper end of the output shaft extends from the upper housing, and the lower end of the output shaft extends from the lower housing.

7. The motor assembly for smart lock according to claim 6, characterized in that: An upper shaft seat is arranged on the inner wall of the upper shell body, a lower shaft seat corresponding to the upper shaft seat is arranged on the inner wall of the lower shell body, and the rotating shaft is arranged between the upper shaft seat and the lower shaft seat.

8. The motor assembly for smart lock according to claim 6, characterized in that: The upper housing is provided with a positioning bearing, the lower housing is provided with an output bearing, the upper end of the output shaft extends from the positioning bearing, and the lower end of the output shaft extends from the output bearing.

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