Driving mechanism and electric curtain

Abstract

The present invention relates to the technical field of drive mechanisms, and more specifically to a drive mechanism and an electric curtain. The drive mechanism includes a motor and a clutch, wherein the motor includes a hollow shaft with an open end; the clutch includes a movable shaft and a functional portion, wherein the movable shaft extends from the open end into the hollow shaft and cooperates with the functional portion, wherein the movable shaft is used to drive a component to be driven, and the functional portion is used to make the movable shaft and the hollow shaft relatively fixed or relatively rotated. The drive mechanism provided by the present invention can rotate the movable shaft inside relative to the hollow shaft with the help of the functional portion even when the power is off, thereby preventing the position or posture of the component to be driven that cooperates with the drive mechanism from being unable to be adjusted in the power-off state.

Description

Technical Field

[0001] The present invention relates to the technical field of drive mechanisms, and in particular to a drive mechanism and an electric curtain. Background Art

[0002] With the development of technology, various automated devices have been invented and applied, making people's lives more and more convenient. For example, electric curtains and electric clothes drying racks, etc. However, if the power is cut off, the motor of the electric curtains will not rotate, and the curtains cannot be opened or closed, which brings many inconveniences to people's lives. Summary of the Invention

[0003] (1) The technical problem to be solved by the present invention is that the current driving mechanism cannot rotate when the power is off, which may cause inconvenience to people's production and life in some cases.

[0004] (2) Technical solution

[0005] In order to achieve the above technical problem, the present invention provides a driving mechanism, which includes a motor, wherein the motor includes a hollow shaft with an open end;

[0006] The clutch includes a movable shaft and a functional part. The movable shaft extends from the open end into the hollow shaft and cooperates with the functional part. The movable shaft is used to drive the component to be driven, and the functional part is used to make the movable shaft and the hollow shaft relatively fixed or relatively rotated.

[0007] Optionally, the functional part includes an electromagnet and a magnetic part, the electromagnet is fixed relative to the hollow shaft, and the magnetic part is connected to the movable shaft.

[0008] When the electromagnet and the magnetic part are attracted to each other, the movable shaft is arranged to be fixed relative to the hollow shaft;

[0009] When the electromagnet and the magnetic portion are separated from each other, the movable shaft is configured to rotate relative to the hollow shaft.

[0010] Optionally, the functional part includes an electromagnet and an iron block, the electromagnet is fixed relative to the hollow shaft, the axial direction of the movable shaft is the same as the direction of gravity, and the iron block is located below the electromagnet and connected to the movable shaft.

[0011] When the electromagnet is attracted to the iron block, the movable shaft is arranged to be fixed relative to the hollow shaft;

[0012] When the electromagnet is separated from the iron block, the movable shaft is configured to rotate relative to the hollow shaft.

[0013] Optionally, a first limiting structure is provided on the movable shaft, and a second limiting structure and a rotational cooperation structure are provided on the hollow shaft. In the rotation direction of the hollow shaft, the first limiting structure and the second limiting structure are limited and cooperated, or the first limiting structure and the rotational cooperation structure are movably cooperated.

[0014] Optionally, the first limiting structure is a keyway extending along the axial direction of the movable shaft, the keyway is recessed relative to the outer surface of the movable shaft, and at least one of two opposite ends of the keyway along the axial direction has an opening;

[0015] The rotational matching structure is the inner surface of the hollow shaft, the second limiting structure is a limiting key, the limiting key protrudes relative to the rotational matching structure, and the limiting key and the keyway are limitedly matched in the rotational direction of the hollow shaft.

[0016] Optionally, a clamping portion is provided at one end of the keyway away from the opening, and the clamping portion is engaged with the limit key in an axial limiting manner along the hollow shaft.

[0017] Optionally, a plurality of the key slots and the limit keys are provided, and the plurality of limit keys are arranged at intervals along the rotation direction of the hollow shaft, and the plurality of key slots and the plurality of limit keys are matched one-to-one.

[0018] Optionally, in the axial direction of the hollow shaft, the maximum length of the limit key is smaller than the maximum translation distance of the movable shaft relative to the hollow shaft.

[0019] Optionally, the driving mechanism provided by the present invention further includes a reducer, and the reducer is in driving connection with the motor.

[0020] Based on any of the driving mechanisms provided above, the present invention further provides an electric curtain, which includes a curtain shaft and any of the driving mechanisms provided above, wherein the driving mechanism is in transmission connection with the curtain shaft.

[0021] (3) Beneficial effects

[0022] The present invention provides a driving mechanism, which includes a motor and a clutch, wherein a movable shaft in the clutch is connected to a hollow shaft in the motor, and the movable shaft is also used to drive a curtain shaft waiting drive component; at the same time, a functional part is provided in the clutch of the driving mechanism, and the movable shaft cooperates with the functional part, so that the movable shaft and the hollow shaft form a relatively fixed or relatively rotating connection relationship under different conditions with the help of the functional part; in detail, when the power is on, the functional part produces a corresponding action, the hollow shaft and the movable shaft are relatively fixed, the hollow shaft rotates, and drives the movable shaft connected thereto to rotate, thereby driving the curtain shaft waiting drive component to rotate, completing the work of opening or closing the curtain; and when the power is off, the movable shaft and the hollow shaft can be separated from each other with the help of the functional part, thereby allowing the component to be driven and the hollow shaft to rotate relative to each other, so that the rotation of the component to be driven is no longer restricted by the magnetic resistance effect of the motor. In this case, the user can manually rotate the curtain shaft waiting drive component, thereby completing the operation of opening and closing the curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The advantages of the above and / or additional aspects of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0024] Figure 1 is a schematic structural diagram of a driving mechanism provided by an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the internal structure of the driving mechanism provided in an embodiment of the present invention;

[0026] Figure 3 is a cross-sectional view of a portion of the structure of the driving mechanism provided by an embodiment of the present invention;

[0027] Figure 4 This is an assembly diagram of the movable shaft and the limiting ring in the driving mechanism provided by an embodiment of the present invention.

[0028] Reference numerals

[0029] 1- Motor;

[0030] 11- hollow shaft;

[0031] 111-limiting ring;

[0032] 112-axis;

[0033] 113-limit key;

[0034] 2- Clutch;

[0035] 21- movable shaft;

[0036] 211-keyway;

[0037] 212-opening;

[0038] 213- holding part;

[0039] 22- Functional part;

[0040] 221-electromagnet;

[0041] 222-iron block;

[0042] 3- reducer;

[0043] 4-housing;

[0044] 5- drive shaft;

[0045] 6-Coupling. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0047] like Figure 1 As shown, the present invention provides a driving mechanism, which includes a motor 1 and a clutch 2, wherein the motor 1 can drive the curtain shaft to wait for the driving component (not shown in the figure) to rotate under the action of electricity, and the clutch 2 can achieve the purpose of connecting and disconnecting the motor 1 and the component to be driven. The motor 1 includes a hollow shaft 11, which is the driving shaft of the motor 1. The hollow shaft 11 is connected to the clutch 2 so that when power is on, the motor 1 can be used to drive the driven component to improve the degree of automation. In order to prevent the hollow shaft 11 and the driven component from being locked due to the magnetic resistance effect of the motor 1 when the power is off, the hollow shaft 11 in the motor 1 of the drive mechanism provided by the present invention is provided with an open end so that the movable shaft 21 of the clutch 2 can extend into the cavity of the hollow shaft 11 through the aforementioned open end. By making the movable shaft 21 cooperate with the functional part 22 in the clutch 2, under the corresponding action of the functional part 22, according to different power-on and power-off conditions, a relatively fixed or relatively rotating relationship can be formed between the movable shaft 21 and the hollow shaft 11, thereby preventing the driven component from being unable to move or change its position even under the action of other external forces due to the magnetic resistance effect of the motor 1 when the power is off.

[0048] In detail, when power is on, the functional part 22 can be used to form a fixed connection between the movable shaft 21 and the hollow shaft 11, so that the motor 1 can drive the component to be driven to the set position under the corresponding instruction, and lock the position of the component to be driven to prevent the component to be driven from moving autonomously or being moved by other external forces; when power is off, the functional part 22 can be used to separate the movable shaft 21 and the hollow shaft 11, so that the component to be driven and the hollow shaft 11 have the conditions for relative rotation, so that even if the motor 1 has a magnetic resistance effect, the component to be driven can move relative to the hollow shaft 11 under the action of the user's manual drive or other forces.

[0049] Specifically, the specific parameters such as the model and power of the motor 1 can be selected according to actual conditions and are not limited here. The size of the movable shaft 21 can be selected according to the size and specifications of the curtain shaft to be driven components; the movable shaft 21 and the driven components can be connected by a transmission member such as a gear mechanism, a chain transmission mechanism or a belt transmission mechanism; preferably, Figure 2 As shown, the drive mechanism provided by the present invention can also be provided with a separate drive shaft 5. The drive shaft 5 can be connected to the movable shaft 21 through one or more couplings 6. In this case, the driven component can be directly connected to the drive shaft 5, thereby improving the ease of use of the drive mechanism. Accordingly, the size of the hollow shaft 11 can be compatible with the size of the movable shaft 21, so that the movable shaft 21 can extend into the hollow shaft 11 through the open end of the hollow shaft 11 and form a relatively fixed or relatively rotating relationship with the hollow shaft 11. There are many specific structures and working principles of the functional part 22. For example, it can be a manual locking structure, so that the purpose of connecting or separating the hollow shaft 11 and the movable shaft 21 is achieved with the help of a mechanical mechanism, and during the operation of the driving mechanism, the user can achieve the purpose of connecting or separating the hollow shaft 11 and the movable shaft 21 by changing the position or internal structure of the functional part 22. Obviously, there are many common components with this function, which will not be introduced one by one here; or, the functional part 22 can also be an automatic locking structure, so as to achieve the purpose of locking and opening the movable shaft 21 and the hollow shaft 11 with the help of external forces such as electricity or elastic force; for example, the functional part 22 can also adopt the electromagnetic principle, and connect or separate the movable shaft 21 and the hollow shaft 11 by magnetic force through the method of electromagnetism. Considering the brevity of the text, it will not be introduced in detail here.

[0050] The present invention provides a drive mechanism, which includes a motor 1 and a clutch 2, wherein a movable shaft 21 in the clutch 2 is connected to a hollow shaft 11 in the motor 1, and the movable shaft 21 is also connected to a curtain shaft waiting drive component; at the same time, a functional part 22 is provided in the clutch 2 of the drive mechanism, and the movable shaft 21 cooperates with the functional part 22, so that the movable shaft 21 and the hollow shaft 11 form a relatively fixed or relatively rotating connection relationship under different conditions with the help of the functional part 22; in detail, when the power is on, the functional part 22 produces a corresponding action, the hollow shaft 11 and the movable shaft 21 are relatively fixed, the hollow shaft 11 rotates, and drives the movable shaft 21 connected thereto to rotate, thereby driving the curtain shaft waiting drive component to rotate, completing the operation of opening and closing the curtain; and when the power is off, the functional part 22 can also separate the movable shaft 21 from the hollow shaft 11, thereby allowing the component to be driven and the hollow shaft 11 to rotate relative to each other, so that the rotation of the component to be driven is no longer restricted by the magnetic resistance effect of the motor. In this case, the user can manually rotate the curtain shaft waiting drive component to complete the operation of opening and closing the curtain.

[0051] Optionally, the functional portion 22 may include an electromagnet and a magnetic portion, and the electromagnet may be equipped with a separate power supply component, such as a battery, and the magnetic portion may be an electromagnet or a permanent magnet. During the assembly process of the drive mechanism, a current in a set direction may be supplied to the electromagnet according to the orientation of the two magnetic poles on the magnetic portion, so that a mutual attraction force is generated between the electromagnet and the magnetic portion, so that the movable shaft and the hollow shaft form a relatively fixed relationship, so that when the motor is operating, the movable shaft is driven to move together to drive the driven component to rotate; accordingly, when the motor is powered off, the power supply component may be controlled to input a reverse current into the coil of the electromagnet, so that the electromagnet and the magnetic portion generate a mutual repulsive force, so that the magnetic portion drives the movable shaft away from the electromagnet, thereby separating the movable shaft and the hollow shaft from each other. In this case, the driven component and the hollow shaft can also move relative to each other, so that under the action of an external force, the driven component can change its position.

[0052] Specifically, parameters such as the number of turns of the electromagnet coil and the magnitude of the current flowing through the coil can be determined based on actual conditions. The maximum distance between the magnetic portion and the electromagnet can also be determined based on actual conditions such as the maximum attraction between the electromagnet and the magnetic portion to ensure that the movable shaft and the hollow shaft can rotate relative to each other and that the electromagnet can be attracted to the magnetic portion under power-on conditions. The magnetic portion can be an iron-cobalt-nickel magnet, the shape and size of which are not limited herein. When the functional portion 22 adopts the above structure, the installation position and installation orientation of the clutch are not restricted, which can diversify and liberalize the application scenarios of the drive mechanism. In addition, the working process of the functional portion 22 of this structure is almost unaffected by external conditions, making it safe, reliable, flexible and changeable.

[0053] Or, as Figure 4As shown, the functional part 22 may further include an electromagnet 221 and an iron block 222, wherein the electromagnet 221 and the hollow shaft 11 may form a fixed connection relationship through a connecting piece. During the assembly of the driving mechanism, the axial direction of the movable shaft 21 may be made the same as the direction of gravity, and the iron block 222 may be installed below the electromagnet 221, and the iron block 222 may be connected to the movable shaft 21. By setting corresponding structures on the movable shaft 21 and the hollow shaft 11, the movable shaft 21 and the hollow shaft 11 may form a relatively fixed connection relationship when the electromagnet 221 and the iron block 222 are attracted to each other. Correspondingly, the movable shaft 21 and the hollow shaft 11 may form a relatively rotating connection relationship when the electromagnet 221 and the iron block 222 are separated from each other.

[0054] In detail, the motor 1 and the electromagnet 221 can share an external power supply, so that when the motor 1 is energized, current also flows through the coil of the electromagnet 221, generating a magnetic force, attracting the iron block 222 to approach the electromagnet 221, and the iron block 222 drives the movable shaft 21 to move, so that the movable shaft 21 and the hollow shaft 11 form a relatively fixed connection relationship. In this state, the motor 1 works and drives the driven component to rotate with the help of the transmission effect of the clutch 2; on the contrary, when the motor 1 is powered off, the electromagnet 221 is powered off, and the iron block 222 falls under the combined action of its own gravity and the gravity of the movable shaft 21, so that the movable shaft 21 and the hollow shaft 11 are separated from each other, and then the movable shaft 21 can rotate or move relative to the hollow shaft 11. Correspondingly, the driven component that rotates relative to the hollow shaft 11 can also rotate and move under the action of other external forces.

[0055] It should be noted that the specific structure and function of the functional part 22 can be changed accordingly according to its own structural composition. It has the function of changing the connection relationship between the hollow shaft 11 and the movable shaft 21 under different conditions. Of course, other mechanisms or components can also be added to the driving mechanism to change the connection relationship between the hollow shaft 11 and the movable shaft 21 when their relative positions are different.

[0056] For example, the movable shaft 21 may be provided with a first limiting structure, and the hollow shaft 11 may be provided with a second limiting structure and a rotational engagement structure. Along the rotational direction of the hollow shaft 11, the first limiting structure and the second limiting structure may engage in a positional engagement, or the first limiting structure and the rotational engagement structure may engage in a flexural engagement. During operation of the drive mechanism, by changing the relative position of the movable shaft 21 and the hollow shaft 11, a relatively fixed or relatively rotational relationship may be established between the movable shaft 21 and the hollow shaft 11. In addition, there are other ways to establish a relatively fixed or relatively rotational relationship between the two, such as the magnetic attraction method or manual locking method described above.

[0057] Specifically, the specific structures of the first limiting structure, the second limiting structure and the rotation cooperation structure can be various. For example, among the first limiting structure and the second limiting structure, one can be a protrusion and the other can be a depression, and by setting the setting positions of the two, the movable shaft 21 and the hollow shaft 11 can form a limiting cooperation relationship in the rotation direction of the hollow shaft 11; accordingly, according to the specific form of the first limiting structure, the specific structure of the rotation cooperation structure can be designed accordingly, so that by changing the relative position of the hollow shaft 11 and the movable shaft 21, the first limiting structure and the rotation cooperation structure are matched, and then the movable shaft 21 and the hollow shaft 11 can rotate relative to each other.

[0058] For example, the first limiting structure may be a strip-shaped protruding structure, the second limiting structure may be a strip-shaped groove, and the rotational cooperation structure may be an annular groove. The rotational cooperation structure is connected to the second limiting structure, and the rotational cooperation structure and the second limiting structure are distributed along the axial direction of the hollow shaft 11. In this case, when the movable shaft 21 extends into the hollow shaft 11, the first limiting structure is inserted into the second limiting structure, so that the movable shaft 21 and the hollow shaft 11 form a limiting cooperation relationship in the rotation direction of the hollow shaft 11; and when the movable shaft 21 translates a certain distance along the axial direction of the hollow shaft 11, the first limiting structure is released from the second limiting structure and cooperates with the rotational cooperation structure. The first limiting structure and the movable limiting structure are rotationally cooperated, that is, they can rotate relative to each other, so that the movable shaft 21 can rotate relative to the hollow shaft 11, and the driven component is also separated from the hollow shaft 11, is not restricted by the motor 1, and can change its own position or posture under the action of other external forces.

[0059] Preferably, if Figure 4As shown, the first limiting structure can be a key groove 211, the extension direction of the key groove 211 is the axial direction of the movable shaft 21, and the key groove 211 is recessed relative to the outer surface of the movable shaft 21; the rotation matching structure can be the inner surface of the hollow shaft 11. Obviously, when the first limiting structure and the rotation matching structure are matched, the hollow shaft 11 and the movable shaft 21 can rotate relative to each other; the second limiting structure is a limiting key 113, and its relative rotation matching structure, that is, the inner surface of the hollow shaft 11 is protruded, and the limiting key 113 can extend into the key groove 211 and By engaging with the keyway 211 in a limited manner, the hollow shaft 11 and the movable shaft 21 form a limited engagement relationship in the rotational direction of the hollow shaft 11. Furthermore, to ensure that the limit key 113 can be disengaged from the keyway 211, at least one of the two opposite ends of the keyway 211 along the aforementioned axial direction can be provided with an opening 212. Thus, by changing the relative position of the movable shaft 21 and the hollow shaft 11 in the axial direction of the hollow shaft 11, the limit key 113 can be disengaged from the keyway 211, thereby breaking the limited connection relationship between the hollow shaft 11 and the movable shaft 21. Specifically, during the design and production process, the keyway 211 and the limit key 113 can be adapted in shape and various dimensions to form a limited engagement relationship between the two.

[0060] Furthermore, in order to prevent the movable shaft 21 from extending into the hollow shaft 11 under the action of the functional part 22, due to factors such as inertia, the overrun phenomenon may cause damage to the motor 1 or other components in the driving mechanism, preferably, as Figure 4 As shown, a holding portion 213 is provided in the keyway 211 in a direction away from the opening 212, and the holding portion 213 cooperates with the limit key at the axial upper limit of the hollow shaft 11, thereby limiting the position of the movable shaft 21 during the relative movement between the movable shaft 21 and the hollow shaft 11 in the axial direction of the hollow shaft 11, preventing the hollow shaft 11 from exceeding the set position due to factors such as inertia and damaging components such as the motor 1.

[0061] In addition, in order to adapt to hollow shafts 11 of different models and sizes, the second limiting structure can be formed by separate molding from the shaft body of the hollow shaft 11, and in order to improve the convenience of assembly, a limiting ring 111 can be provided. The limiting ring 111 can be made of a material with high hardness, wear resistance and deformation resistance such as metal, so as to prevent the limiting ring 111 from being damaged after the drive mechanism has been working for a period of time; the second limiting structure such as the limiting key 113 can be connected to the inner wall of the through hole of the limiting ring 111, so that the limiting ring 111 can be fixed to the inner wall of the through hole of the limiting ring 111. The positioning key 113 and the limiting ring 111 form an integral structure, and according to different sizes, they are adapted to the shaft body 112 of the hollow shaft 11 of different models and sizes. The two can be connected by a connecting piece. Along the axial direction of the hollow shaft 11, the open ends of the limiting ring 111 and the shaft body 112 are respectively located at the opposite ends of the hollow shaft 11, so that during the assembly and operation of the driving mechanism, when the movable shaft 21 extends out of the hollow shaft 11 from the open end, its position is limited to the position where the clamping portion 213 cooperates with the limiting key 113.

[0062] In order to further improve the limiting cooperation effect between the movable shaft 21 and the hollow shaft 11, preferably, a plurality of limiting keys 113 and key slots 211 can be provided, and the plurality of limiting keys 113 can be arranged at intervals along the rotation direction of the hollow shaft 11. During the operation of the driving mechanism, the plurality of limiting keys 113 can be matched with the plurality of key slots 211 in a one-to-one correspondence, thereby improving the reliability of the limiting connection relationship between the hollow shaft 11 and the movable shaft 21. For example, there can be two, three or more key slots 211, and in order to improve the uniformity of the force applied to each limiting key 113, preferably, the plurality of key slots 211 can be evenly distributed along the rotation direction of the movable shaft 21. In addition, in order to prevent the excessive number of key slots 211 from causing the limiting reliability between the groove wall of the key slot 211 and the limiting key 113 to be excessively reduced, preferably, there can be two or three key slots 211.

[0063] Furthermore, in the axial direction of the hollow shaft 11, the maximum length of the limit key 113 can be made smaller than the maximum movable distance of the movable shaft 21 relative to the hollow shaft 11, or in other words, the maximum length of the limit key 113 can be made smaller than the maximum length of the key slot 211, thereby preventing the limit key 113 and the movable shaft 21 from rubbing against each other or even causing obstruction during the rotation of the movable shaft 21 relative to the hollow shaft 11, and ensuring that after the limit key 113 and the key slot 211 are separated from each other, the movable shaft 21 can rotate relative to the hollow shaft 11 almost unimpeded.

[0064] Further, if Figure 1 and Figure 2As shown, the driving mechanism provided by the present invention may further include a reducer 3. During the assembly process of the driving mechanism, the reducer 3 can be connected to the motor 1 in a transmission manner to increase the output torque while reducing the rotational speed, and can also reduce the inertia of the load, thereby improving the service life and working performance of the entire driving mechanism. Specifically, the model and specific parameters of the reducer 3 can be determined based on the parameters of the selected motor 1, etc., and are not limited here. In addition, the driving mechanism provided by the present invention also includes a housing 4, and the motor 1, the clutch 2 and the reducer 3 are all installed in the housing 4, so as to provide a certain protection for the above three with the help of the housing 4, prevent external components from having an adverse effect on the operation of the driving mechanism, and improve the service life and working performance of the entire driving mechanism.

[0065] Based on the driving mechanism provided in any of the above embodiments, the present invention further provides an electric curtain, which includes a curtain shaft and any of the above driving mechanisms, and the driving mechanism is transmission-connected to the curtain shaft.

[0066] In the description of the present invention, it should be noted that the terms "upper" and "lower" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or they can refer to connections between the internal parts of two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A driving mechanism, characterized in that: include: A motor (1), comprising a hollow shaft (11) having an open end; A clutch (2), the clutch (2) comprising a movable shaft (21) and a functional portion (22), the movable shaft (21) extending from the open end into the hollow shaft (11) and cooperating with the functional portion (22), the movable shaft (21) being used to drive a component to be driven, and the functional portion (22) being used to relatively fix or relatively rotate the movable shaft (21) and the hollow shaft (11); The movable shaft (21) is provided with a first limiting structure, and the hollow shaft (11) is provided with a second limiting structure and a rotational matching structure, the second limiting structure and the rotational matching structure are distributed along the axial direction of the hollow shaft (11), and in the rotation direction of the hollow shaft (11), the first limiting structure and the second limiting structure are in limiting matching, or the first limiting structure and the rotational matching structure are in active matching; The first limiting structure is a keyway (211) extending along the axial direction of the movable shaft (21), the keyway (211) is recessed relative to the outer surface of the movable shaft (21), and at least one of the two opposite ends of the keyway (211) along the axial direction has an opening (212); The rotational matching structure is the inner surface of the hollow shaft (11), the second limiting structure is a limiting key (113), the limiting key (113) protrudes relative to the rotational matching structure, and the limiting key (113) and the key slot (211) are in upper limit matching in the rotational direction of the hollow shaft (11); A clamping portion (213) is provided at one end of the keyway (211) away from the opening (212), and the clamping portion (213) is engaged with the limiting key (113) along the axial direction of the hollow shaft (11).

2. The driving mechanism according to claim 1, wherein: The functional part (22) includes an electromagnet and a magnetic part, the electromagnet is relatively fixed to the hollow shaft (11), and the magnetic part is connected to the movable shaft (21). In a state where the electromagnet and the magnetic portion are attracted to each other, the movable shaft (21) is arranged to be fixed relative to the hollow shaft (11); When the electromagnet and the magnetic portion are separated from each other, the movable shaft (21) is configured to rotate relative to the hollow shaft (11).

3. The driving mechanism according to claim 1, wherein: The functional part (22) includes an electromagnet (221) and an iron block (222). The electromagnet (221) is relatively fixed to the hollow shaft (11). The axial direction of the movable shaft (21) is the same as the direction of gravity. The iron block (222) is located below the electromagnet (221) and is connected to the movable shaft (21). When the electromagnet (221) and the iron block (222) are in an engaged state, the movable shaft (21) is arranged to be fixed relative to the hollow shaft (11); When the electromagnet (221) is separated from the iron block (222), the movable shaft (21) is configured to rotate relative to the hollow shaft (11).

4. The driving mechanism according to claim 1, wherein: The key slots (211) and the limit keys (113) are both provided in plurality, and the limit keys (113) are arranged at intervals along the rotation direction of the hollow shaft (11), and the key slots (211) and the limit keys (113) are matched one-to-one.

5. The driving mechanism according to claim 1, characterized in that: In the axial direction of the hollow shaft (11), the maximum length of the limit key (113) is less than the maximum translation distance of the movable shaft (21) relative to the hollow shaft (11).

6. The driving mechanism according to any one of claims 1 to 5, characterized in that: It also includes a reducer (3), which is in transmission connection with the motor (1).

7. An electric curtain, characterized in that: The curtain shaft comprises a driving mechanism according to any one of claims 1 to 6, wherein the driving mechanism is in driving connection with the curtain shaft.

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