CN216867425U

CN216867425U - Driver

Info

Publication number: CN216867425U
Application number: CN202220231857.4U
Authority: CN
Inventors: 林国伟; 关文华
Original assignee: Guangdong Dongjian Automobile Technology Co Ltd
Current assignee: Guangdong Dongjian Automobile Technology Co Ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-07-01
Anticipated expiration: 2032-01-27

Abstract

The utility model discloses a driver, which comprises a base, a motor with an output shaft, a first worm in transmission connection with the output shaft, a first worm wheel rotatably mounted on the base and meshed with the first worm, a transmission shaft connected with the first worm wheel, a sliding shaft, a clutch gear and an output gear meshed with the clutch gear, wherein the first worm wheel is rotatably mounted on the base; the sliding shaft is provided with an insertion hole, one end of the transmission shaft is arranged in the insertion hole in a sliding mode and rotates synchronously with the sliding shaft, the sliding shaft is provided with a first meshing part, and the clutch gear is provided with a second meshing part; when the sliding shaft is positioned at the self-locking position, the first meshing part and the second meshing part are meshed with each other; when the sliding shaft is located at the unlocking position, the first meshing part of the sliding shaft is separated from the second meshing part of the clutch gear. The utility model not only realizes normal transmission when the motor is electrified and self-locking under the condition of power failure, but also can remove the self-locking function under the condition of failure. When the fault condition is eliminated, the self-locking state can be switched to, and the automobile part switching device belongs to the technical field of automobile parts.

Description

Driver

Technical Field

The utility model relates to the technical field of automobile parts, in particular to a driver.

Background

With the popularization of automobiles, the performance of automobiles becomes a factor considered by more and more consumers, wherein the intellectualization and the safety of automobiles are factors considered by consumers. At present the car is in order to improve intelligent degree, generally adopts motor drive reduction gear set to start the door, carriage etc. and realize automatic opening and closing, and the motor that uses on the automobile of market probably two kinds: the first is a motor with self-locking function, the motor is driven by a worm gear and a worm, the helical angle of the worm is smaller than the friction angle of the contact surface of the worm gear and the worm, the motor can control rotation under the condition of power-on, and the helical angle of the worm is smaller than the friction angle of the contact surface of the worm gear and the worm, so that self-locking is realized under the condition of power-off, the motor cannot rotate, and the gear at the output end cannot rotate. However, the motor with the self-locking function cannot unlock the self-locking under the fault condition, so that the doors, the carriages and the like cannot be opened, and potential safety hazards exist. The second type is the motor that does not have self-locking function, can control under the motor circular telegram condition and rotate, under the outage condition, also can rotate, can't use under the environment that needs auto-lock, theftproof.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problems in the prior art, the utility model aims to: the utility model provides a driver, which can realize normal transmission when a motor is electrified and self-locking under the condition of power failure and can remove the self-locking function under the condition of failure. When the fault condition is eliminated, the self-locking state can be switched to.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a driver comprises a base, a motor with an output shaft, a first worm in transmission connection with the output shaft, a first worm wheel rotatably mounted on the base and meshed with the first worm, a transmission shaft connected with the first worm wheel, a sliding shaft, a clutch gear and an output gear meshed with the clutch gear; the helix angle of the first worm is smaller than the friction angle of the first worm wheel and the first worm contact surface;

the sliding shaft is provided with a jack, one end of the transmission shaft is slidably arranged in the jack and synchronously rotates with the sliding shaft, the sliding shaft is provided with a first meshing part, and the clutch gear is provided with a second meshing part;

the sliding shaft is switched between a self-locking position and an unlocking position; when the sliding shaft is positioned at the self-locking position, the first meshing part and the second meshing part are meshed with each other; when the sliding shaft is located at the unlocking position, the first meshing part is separated from the second meshing part.

Further, the driver further comprises a driving assembly for driving the sliding shaft to switch between the self-locking position and the unlocking position.

The driving assembly comprises a first limiting plate arranged on the sliding shaft, a second limiting plate fixed on the base, a spring clamped between the first limiting plate and the second limiting plate and used for applying elastic force to the first limiting plate to enable the first meshing part and the second meshing part to be meshed with each other, and a driving block used for driving the sliding shaft to slide to enable the first meshing part and the second meshing part to be separated; the spring is sleeved on the sliding shaft and the transmission shaft.

Further, the driving block is pivoted to the base through a pivot, a rotation axis of the driving block is parallel to a sliding direction of the sliding shaft, a sliding groove is formed in the driving block, the sliding groove is provided with an abutting inner wall used for guiding the sliding shaft to slide along the axis direction of the spring so that the first engaging portion is separated from the second engaging portion, and the abutting inner wall abuts against the sliding shaft.

Further, a guide bar is arranged on the base; the conducting bar is arc-shaped, the circle center of the conducting bar coincides with the rotation center of the driving block, an arc guide groove matched with the conducting bar is further formed in the driving block, and the conducting bar is arranged in the arc guide groove in a sliding mode.

Further, the driver also comprises a second worm which is connected with the output shaft and synchronously rotates, and a second worm wheel which is connected with the first worm and coaxially rotates; the second worm wheel is meshed with the second worm.

Further, the base comprises a shell and a cover body covering the shell; the cover body and the shell body jointly enclose to form a cavity; the shell is provided with a first shaft hole communicated with the cavity, and the cover body is provided with a second shaft hole communicated with the cavity;

the first worm, first worm wheel the output gear clutch gear the transmission shaft is installed respectively in the cavity, the output shaft passes first shaft hole with first worm transmission is connected, the one end of sliding shaft is located outside the cavity, the other end of sliding shaft passes the second shaft hole just is equipped with the jack.

Furthermore, the jack is prism-shaped, and one end of the transmission shaft is provided with a prism matched with the jack.

Further, the first meshing part is a bevel gear fixed on the sliding shaft, the bevel gear is provided with external gear teeth, and the diameter of the bevel gear is gradually increased along the direction departing from the transmission shaft; the clutch gear is provided with a through hole, the axis of the through hole is superposed with the axis of the clutch gear, and the second meshing part is an inner gear tooth which is arranged on the inner wall of the through hole and matched with the outer gear tooth.

Further, the motor comprises a casing, a rotor winding which is provided with the output shaft and is arranged in the casing, magnetic shoes which are arranged in the casing, and a Hall plate which is arranged on the casing.

Compared with the prior art, the utility model has the beneficial effects that: when the motor of the driver is electrified, the motor can drive the output gear to normally drive through the transmission of the first worm wheel and the first worm. Under the condition of power failure, the helix angle of the first worm is smaller than the friction angle of the contact surface of the first worm wheel and the first worm, so that self-locking can be realized. When breaking down, through switching to the unblock position with the sliding shaft for output gear can rotate, meets under the trouble condition, can remove self-locking function, is convenient for the manual control of car function. When the fault condition is eliminated, the automobile can be switched to a self-locking state again, and the motor can be normally controlled, so that the use safety of the automobile is improved.

Drawings

FIG. 1 is a schematic diagram of a drive configuration;

FIG. 2 is a schematic view of the structure of the actuator, with the cover of the base omitted;

FIG. 3 is a schematic connection diagram of the motor, the first worm wheel, the transmission shaft, the sliding shaft, the clutch gear, the output gear, the second worm and the second worm wheel;

FIG. 4 is a schematic connection diagram of a first worm, a first worm wheel, a transmission shaft, a sliding shaft, a clutch gear, an output gear, a second worm and a second worm wheel;

FIG. 5 is a schematic connection diagram of the first worm, the first worm wheel, the transmission shaft, the sliding shaft, the clutch gear, the second worm and the second worm wheel;

FIG. 6 is a schematic view showing the connection of the transmission shaft, the sliding shaft and the clutch gear;

FIG. 7 is an exploded view of FIG. 6;

fig. 8 is a schematic structural diagram of a driving block.

In the figure, 1, a base; 2. a motor; 3. a first worm; 4. a first worm gear; 5. a drive shaft; 6. a sliding shaft; 7. a clutch gear; 8. an output gear; 9. a drive assembly; 10. a second worm; 11. a second worm gear; 12. a clamping block; 13; a card slot;

101. a housing; 102. a cover body; 103. conducting bars; 501. a prism; 601. a first engaging portion; 602. a jack; 701. a second engaging portion; 901. a first limit plate; 902. a second limiting plate; 903. a spring; 904. a drive block; 905. a pivot; 906. a chute; 907. abutting against the inner wall; 908. and an arc guide groove.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used in the present invention to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, the "first" information may also be referred to as "second" information, and similarly, the "second" information may also be referred to as "first" information, without departing from the scope of the utility model.

As shown in fig. 1 to 4, the present embodiment provides a driver, which includes a base 1, a motor 2 having an output shaft, a first worm 3 in transmission connection with the output shaft, a first worm wheel 4 rotatably mounted on the base 1 and engaged with the first worm 3, a transmission shaft 5 connected with the first worm wheel 4 and rotating synchronously, a sliding shaft 6, a clutch gear 7, and an output gear 8 engaged with the clutch gear 7; the motor 2 drives the first worm 3 to rotate, the first worm 3 drives the first worm wheel 4 to rotate, the first worm wheel 4 drives the transmission shaft 5 to rotate, the transmission shaft 5 drives the clutch gear 7 to rotate through the sliding shaft 6, and the clutch gear 7 drives the output gear 8 to rotate. The helix angle of the first worm 3 is smaller than the friction angle of the contact surface of the first worm wheel 4 and the first worm 3; therefore, only the first worm 3 can drive the first worm wheel 4 to rotate, and the first worm wheel 4 cannot drive the first worm 3 to rotate. When the motor 2 is powered on, the output shaft of the motor 2 can indirectly drive the output gear 8 to rotate, but the output gear 8 cannot reversely drive the output shaft of the motor 2 to rotate, so that when the motor 2 is powered off, the output gear 8, the first worm wheel 4, the first worm 3, the clutch gear 7 and the like cannot rotate, and the self-locking of the driver is realized.

The jack 602 is provided on the sliding shaft 6, one end of the transmission shaft 5 is slidably provided in the jack 602 and rotates synchronously with the sliding shaft 6, the sliding shaft 6 is connected with the transmission shaft 5 through the jack 602, the sliding shaft 6 can slide along the rotation axis direction of the transmission shaft 5 but cannot rotate relatively, the transmission shaft 5 is driven by the first worm wheel 4 to rotate synchronously and coaxially with the first worm wheel 4, and the transmission shaft 5 drives the sliding shaft 6 to rotate synchronously and coaxially when rotating.

The slide shaft 6 has a first engaging portion 601, and the clutch gear 7 is provided with a second engaging portion 701 for engaging with the first engaging portion 601; when the first engaging portion 601 of the sliding shaft 6 engages with the second engaging portion 701 of the clutch gear 7, the sliding shaft 6 drives the clutch gear 7 to rotate synchronously and coaxially. When the first meshing part 601 of the sliding shaft 6 is separated from the second meshing part 701 of the clutch gear 7, the connection between the sliding shaft 6 and the clutch gear 7 is disconnected, the sliding shaft 6 idles, the sliding shaft 6 cannot drive the clutch gear 7 to rotate, and conversely, the rotation of the clutch gear 7 cannot drive the sliding shaft 6 to rotate.

The slide shaft 6 is switched between the self-locking position and the unlocking position by driving the slide shaft 6 to slide in the direction of the rotational axis of the transmission shaft 5. When the slide shaft 6 is located at the self-locking position, the first engagement portion 601 of the slide shaft 6 and the second engagement portion 701 of the clutch gear 7 are engaged with each other so that the slide shaft 6 and the clutch gear 7 rotate synchronously. When the slide shaft 6 is located at the unlock position, the first engagement portion 601 of the slide shaft 6 is separated from the second engagement portion 701 of the clutch gear 7. During normal operating condition, sliding shaft 6 is located the auto-lock position, and when motor 2 circular telegram, output gear 8 rotation can be driven indirectly to the output shaft of motor 2. When the motor 2 is powered off, the self-locking is realized because the spiral angle of the first worm 3 is smaller than the friction angle of the contact surface of the first worm wheel 4 and the first worm 3. When the motor 2 is in failure and the output end of the output gear 8 needs to be manually driven to work, the sliding shaft 6 is driven to slide to enable the sliding shaft 6 to be located at an unlocking position, at the moment, the first meshing portion 601 of the sliding shaft 6 is separated from the second meshing portion 701 of the clutch gear 7, the rotation of the clutch gear 7 cannot be transmitted to the first worm wheel 4 through the sliding shaft 6 and the transmission shaft 5, the rotation of the clutch gear 7 and the output gear 8 cannot be influenced by the self-locking of the first worm wheel 4 and the first worm 3, and therefore the clutch gear 7 and the output gear 8 can rotate to achieve unlocking.

Specifically, in one embodiment, the insertion hole 602 may also be provided on the transmission shaft 5, and one end of the sliding shaft 6 is inserted into the insertion hole 602.

In particular, in one embodiment, the drive further comprises a drive assembly 9 for driving the sliding shaft 6 to switch between the self-locking position and the unlocking position. The driving assembly 9 may drive the sliding shaft 6 to slide such that the first engaging portion 601 of the sliding shaft 6 and the second engaging portion 701 of the clutch gear 7 are engaged with each other or the first engaging portion 601 of the sliding shaft 6 and the second engaging portion 701 of the clutch gear 7 are disengaged.

Specifically, in an embodiment, the two ends of the rotating rod of the first worm 3 are respectively provided with a clamping block 12, the base 1 is provided with two clamping grooves for clamping the clamping blocks 12, the two clamping grooves correspond to the two clamping blocks 12 one to one, the clamping blocks 12 are square, four end-to-end sides of the clamping blocks 12 which are sequentially connected are respectively provided with a limiting convex block, the limiting convex blocks on the four side surfaces are distributed in a cross shape, the clamping grooves are square grooves, four side walls of the clamping grooves are respectively provided with a limiting groove for clamping the limiting convex blocks, the first worm 3 is detachably mounted on the base 1 through the matching of the clamping blocks 12 and the clamping grooves, and the first worm 3 is convenient to mount and dismount.

Specifically, in one embodiment, there are a plurality of output gears 8, and the plurality of output gears 8 are sequentially engaged, wherein one output gear 8 is engaged with the clutch gear 7. The diameter of the output gear 8 meshed with the clutch gear 7 is larger, and the diameters of other output gears 8 are reduced in sequence, so that the speed reduction transmission is realized.

Specifically, as shown in fig. 4 to 8, in one embodiment, the driving assembly 9 includes a first limiting plate 901 disposed on the sliding shaft 6, a second limiting plate 902 fixed on the base 1, a spring 903 sandwiched between the first limiting plate 901 and the second limiting plate 902 and configured to apply an elastic force to the first limiting plate 901 to engage the first engaging portion 601 and the second engaging portion 701 with each other, and a driving block 904 configured to drive the sliding shaft 6 to slide to separate the first engaging portion 601 and the second engaging portion 701; the spring 903 is fitted over the sliding shaft 6 and the transmission shaft 5. First limiting plate 901 is fixed on sliding shaft 6, and first limiting plate 901 and sliding shaft 6 integrated into one piece guarantee joint strength. The second limiting plate 902 is fixed on the base 1 through bolts, the second limiting plate 902 is located behind the first worm wheel 4 and the first limiting plate 901, and the second limiting plate 902 is provided with a round hole for the transmission shaft 5 to pass through. The slide shaft 6 is held in the self-locking position by the spring 903, and the first engagement portion 601 of the slide shaft 6 is held in engagement with the second engagement portion 701 of the clutch gear 7. When the slide shaft 6 is driven to slide by pressing so that the slide shaft 6 is switched from the self-locking position to the unlocking position, the first stopper plate 901 compresses the spring 903, the slide shaft 6 slides in a direction approaching the transmission shaft 5, and the first engaging portion 601 of the slide shaft 6 is separated from the second engaging portion 701 of the clutch gear 7, so that unlocking is performed. After the sliding shaft 6 is loosened, the sliding shaft 6 automatically resets to the self-locking position.

Specifically, in one embodiment, the driving block 904 is pivoted to the base 1 through a pivot 905, a rotation axis of the driving block 904 is parallel to a sliding direction of the sliding shaft 6, a sliding slot 906 is formed in the driving block 904, the sliding slot 906 has an abutting inner wall 907 for guiding the sliding shaft 6 to slide along an axial direction of the spring 903 so as to separate the first engaging portion 601 from the second engaging portion 701, and the abutting inner wall 907 abuts against the sliding shaft 6. The abutting inner wall 907 is a concave arc surface, a hemisphere is arranged at one end of the sliding shaft 6 abutting against the abutting inner wall 907, the spherical surface of the hemisphere abuts against the concave arc surface, and the sliding track of the hemisphere on the abutting inner wall 907 is an arc track. When the driving block 904 rotates, the hemisphere gradually approaches the notch of the sliding chute 906 under the action of the abutting inner wall 907, the abutting inner wall 907 presses the sliding shaft 6, so that the sliding shaft 6 slides towards the direction close to the transmission shaft 5, and the first meshing part 601 and the second meshing part 701 are separated. After the driving block 904 is released, the hemisphere automatically slides to the deepest position of the sliding groove 906 along the abutting inner wall 907 in a direction away from the transmission shaft 5 under the action of the spring 903, and the first meshing part 601 and the second meshing part 701 mesh with each other.

Specifically, in one embodiment, the base 1 is provided with a conductive bar 103; the guide bar 103 is integrally formed with the base 1. The conducting bar 103 is arc-shaped, the circle center of the conducting bar 103 coincides with the rotation center of the driving block 904, an arc guide groove 908 matched with the conducting bar 103 is further formed in the driving block 904, the driving block 904 covers the conducting bar 103 through the arc guide groove 908, and when the driving block 904 rotates, the driving block 904 slides along the arc track of the conducting bar 103, so that the driving block 904 slides more stably and smoothly.

Specifically, in one embodiment, the driver further comprises a second worm 10 connected with the output shaft and rotating synchronously, a second worm wheel 11 connected with the first worm 3 and rotating synchronously; the second worm 10 is directly connected with the output shaft of the motor 2, the second worm wheel 11 is meshed with the second worm 10, and the second worm wheel 11 is installed on the rotating rod of the first worm 3 and rotates synchronously with the first worm 3.

The helix angle of the second worm 10 is smaller than the friction angle of the contact surface of the second worm wheel 11 and the second worm 10. The rotating speed of the second worm and the rotating speed of the output shaft of the motor are both 3000r/min, the second worm and the second worm wheel perform gear transmission, the second worm is a 3-head worm, the number of teeth of the second worm wheel is 20, and the gear ratio of the second worm to the second worm wheel is 3: 20. The first worm is a 2-head worm, the number of teeth of the first worm gear is 25, and the gear ratio of the first worm to the first worm gear is 2: 25. Through the transmission action of the first worm wheel, the first worm, the second worm wheel and the second worm, the rotating speed output by the motor is reduced from 3000r/min to 36r/min, and the speed reduction function of the motor is realized.

Specifically, in one embodiment, the number of worm sets of the driver can be set according to actual needs. The helix angle of the worm in at least one worm gear and worm set is smaller than the friction angle of the contact surface of the worm gear and the worm. That is, in the present application, the helix angle of the first worm 3 may be smaller than the friction angle between the contact surfaces of the first worm wheel 4 and the first worm 3, the helix angle of the second worm 10 may be smaller than the friction angle between the contact surfaces of the second worm wheel 11 and the second worm 10, or the helix angle of the first worm 3 may be smaller than the friction angle between the contact surfaces of the first worm wheel 4 and the first worm 3, and the helix angle of the second worm 10 may be smaller than the friction angle between the contact surfaces of the second worm wheel 11 and the second worm 10.

Specifically, in one embodiment, the base 1 includes a housing 13; a card slot; 101. the cover is arranged on the shell 13; a card slot; 101, a cover 102; a cover 102 and a case 13; a card slot; 101 together enclose to form a cavity; the cavity is in a closed state, and plays a role in dust prevention and water prevention. A housing 13; a card slot; a first shaft hole communicated with the cavity is formed in the cover body 101, and a second shaft hole communicated with the cavity is formed in the cover body 102.

The transmission parts such as the first worm 3, the first worm wheel 4, the output gear 8, the clutch gear 7, the transmission shaft 5, the second worm 10 and the second worm wheel 11 are respectively arranged in the cavity, so that the transmission precision of the transmission parts such as the first worm 3, the first worm wheel 4, the output gear 8, the clutch gear 7, the transmission shaft 5, the second worm 10 and the second worm wheel 11 is prevented from being influenced by water and dust. The output shaft passes through first shaft hole and is connected with first worm 3 transmission, and the one end of sliding shaft 6 is located outside the cavity, and the other end of sliding shaft 6 passes the second shaft hole and is equipped with jack 602. The output shaft of the output gear 8 extends from the cavity to the outside of the cavity.

Specifically, in one embodiment, the insertion hole 602 is in the shape of a prism 501, and one end of the transmission shaft 5 is provided with the prism 501 matched with the insertion hole 602. In this embodiment, the insertion hole 602 is a hole having a regular hexagonal cross section, and the prism 501 is a hexagonal prism 501, so that the sliding shaft 6 can be driven by the transmission shaft 5 to rotate while the insertion hole 602 slides.

Specifically, in one embodiment, the first engaging part 601 is a bevel gear fixed on the sliding shaft 6, the bevel gear has external teeth, and the diameter of the bevel gear gradually increases along the direction away from the transmission shaft 5; the clutch gear 7 is provided with a through hole, the axis of the through hole coincides with the axis of the clutch gear 7, and the second meshing part 701 is an inner gear tooth which is arranged on the inner wall of the through hole and matched with an outer gear tooth. When the sliding shaft 6 is switched to the self-locking position, the first meshing part 601 and the second meshing part 701 are just completely meshed, and as the diameter of the bevel gear is gradually increased in the direction departing from the transmission shaft 5, the sliding shaft 6 can not slide in the direction departing from the transmission shaft 5, and the positioning is realized. When the slide shaft 6 is switched to the unlock position, it is positioned by the second stopper plate 902.

Specifically, in one embodiment, the outer teeth of the bevel gear form a male surface of a spline tooth conical surface, the bevel gear is formed by enclosing a plurality of convex arc surfaces with arc-shaped cross sections, and the outer teeth are connected smoothly. The inner gear teeth of the clutch gear 7 form a female surface of a flower tooth conical surface, and the inner wall of the through hole is provided with a plurality of concave arcs to form the inner gear teeth. The convex arc surface and the concave arc are matched, so that friction suitable for sliding of the sliding shaft 6 can be reduced, the convex arc surface and the concave arc are more smooth in clamping or separation, the rigid collision strength between the sliding shaft 6 and the clutch gear 7 in the meshing process of the convex arc surface and the concave arc can be reduced, and the service lives of the sliding shaft 6 and the clutch gear 7 are prolonged.

Specifically, in one embodiment, the motor 2 includes a housing, a rotor winding having an output shaft and mounted within the housing, magnetic shoes mounted within the housing, and a hall plate mounted on the housing. After the motor is electrified, the rotor rotates at a high speed under the action of the magnetic shoe to drive the second worm to rotate quickly.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A driver, characterized by: the worm gear type clutch comprises a base, a motor with an output shaft, a first worm in transmission connection with the output shaft, a first worm wheel which is rotatably installed on the base and meshed with the first worm, a transmission shaft connected with the first worm wheel, a sliding shaft, a clutch gear and an output gear meshed with the clutch gear; the helix angle of the first worm is smaller than the friction angle of the first worm wheel and the first worm contact surface;

2. A driver according to claim 1, wherein: the sliding shaft is driven to switch between the self-locking position and the unlocking position by the driving assembly.

3. A driver according to claim 2, wherein: the driving assembly comprises a first limiting plate arranged on the sliding shaft, a second limiting plate fixed on the base, a spring clamped between the first limiting plate and the second limiting plate and used for applying elastic force to the first limiting plate so as to enable the first meshing part and the second meshing part to be meshed with each other, and a driving block used for driving the sliding shaft to slide so as to enable the first meshing part and the second meshing part to be separated; the spring is sleeved on the sliding shaft and the transmission shaft.

4. A driver according to claim 3, wherein: the driving block is pivoted on the base through a pivot, the rotating axis of the driving block is parallel to the sliding direction of the sliding shaft, a sliding groove is formed in the driving block, the sliding groove is provided with an abutting inner wall used for guiding the sliding shaft to slide along the axis direction of the spring so that the first engaging portion is separated from the second engaging portion, and the abutting inner wall abuts against the sliding shaft.

5. An actuator according to claim 4, wherein: the base is provided with a guide bar; the conducting bar is arc-shaped, the circle center of the conducting bar coincides with the rotation center of the driving block, an arc guide groove matched with the conducting bar is further formed in the driving block, and the conducting bar is arranged in the arc guide groove in a sliding mode.

6. A driver according to claim 1, wherein: the second worm is connected with the output shaft and synchronously rotates, and the second worm wheel is connected with the first worm and coaxially rotates; the second worm wheel is meshed with the second worm.

7. A driver according to claim 1, characterized in that: the base comprises a shell and a cover body covering the shell; the cover body and the shell body jointly enclose to form a cavity; the shell is provided with a first shaft hole communicated with the cavity, and the cover body is provided with a second shaft hole communicated with the cavity;

8. A driver according to claim 1, wherein: the jack is prismatic, and one end of the transmission shaft is provided with a prism matched with the jack.

9. A driver according to claim 8, wherein: the first meshing part is a bevel gear fixed on the sliding shaft, the bevel gear is provided with external gear teeth, and the diameter of the bevel gear is gradually increased along the direction departing from the transmission shaft; the clutch gear is provided with a through hole, the axis of the through hole is superposed with the axis of the clutch gear, and the second meshing part is an inner gear tooth which is arranged on the inner wall of the through hole and matched with the outer gear tooth.

10. A driver according to claim 1, wherein: the motor comprises a shell, a rotor winding which is provided with the output shaft and is arranged in the shell, magnetic shoes which are arranged in the shell, and a Hall plate which is arranged on the shell.