CN111379495A - Automobile rear cover driving device - Google Patents

Abstract

The present disclosure provides a rear cover driving apparatus for an automobile, including: the gear box assembly, the motor assembly, the threaded rod assembly and the nut pipe assembly; the gear box assembly transmits the motion output by the motor assembly to the threaded rod assembly so that the threaded rod assembly rotates; the threaded rod assembly is connected with the nut pipe assembly in a threaded fit manner; rotation of the threaded rod assembly rotates the nut tube assembly such that the nut tube assembly reciprocates axially of the threaded rod assembly.

Description

Automobile rear cover driving device

Technical Field

The present disclosure relates to an automobile rear cover driving apparatus.

Background

In the automobile market, along with the popularization of the application trend of vehicle price undersensing and intelligent products, more and more brands of automobiles have the function of the electric rear cover, and the function realizes the automatic opening and closing of the rear cover through a driving device, so that the convenience of customers is further improved; this function still possesses customer remote operation, and barrier detection, intellectuality are opened etc. have also promoted the science and technology sense of whole car greatly.

In the prior art, the rear cover driving device mainly includes a rocker arm type driving device, as shown in fig. 1, including a motor 1 ', a rocker arm 2 ', a connecting rod 3 ', and the like. The motor 1 ' is generally fixed on the vehicle body, the rocker arm 2 ' and the connecting rod 3 ' are connected through a ball head, the connecting rod 3 ' is connected on the rear cover hinge 4 ' through the ball head, and the rear cover hinge 4 ' is fixed on the rear cover 5 '. The principle is as follows: after a user sends a control instruction through the control device, the motor 1 ' drives the rocker arm 2 ' to rotate after reducing speed and increasing torque through the gear, and the rocker arm 2 ' drives the rear cover hinge 4 ' to rotate through the connecting rod 3 ', so that the rear cover 5 ' is opened or closed along with the rotation of the motor 1 '. This type of drive is generally bulky and costly. And since the swing arm 2 'and the connecting rod 3' require a large movement space for rotation, it needs to occupy a large space inside the trunk (trunk), thereby affecting the trunk volume and the use of the user.

Disclosure of Invention

In order to solve at least one of the above technical problems, the present disclosure provides an automobile rear cover driving apparatus, which is implemented by the following technical solutions.

An automotive rear cover driving apparatus comprising: the gear box assembly, the motor assembly, the threaded rod assembly and the nut pipe assembly; the gear box assembly transmits the motion output by the motor assembly to the threaded rod assembly so that the threaded rod assembly rotates; the threaded rod assembly is connected with the nut pipe assembly in a threaded fit manner; rotation of the threaded rod assembly rotates the nut tube assembly such that the nut tube assembly reciprocates axially of the threaded rod assembly.

According to at least one embodiment of the present disclosure, the automotive tailgate drive arrangement further comprises a first ball and socket assembly and a second ball and socket assembly; the first ball socket assembly is fixedly connected with the gear box assembly, and the nut pipe assembly is fixedly connected with the second ball socket assembly.

According to at least one embodiment of the present disclosure, the driving device for the rear cover of the automobile further comprises a spring, wherein the spring is sleeved on the outer sides of the threaded rod assembly and the nut tube assembly; the first end of the spring is fixedly connected with the first ball-and-socket assembly, and the second end of the spring is fixedly connected with the second ball-and-socket assembly.

According to at least one embodiment of the present disclosure, the gearbox assembly includes a worm gear drive that reverses the motion output by the motor assembly.

According to at least one embodiment of this disclosure, the worm gear and worm drive mechanism includes worm wheel and worm, and automobile rear cover drive device still includes the shaft coupling, and the worm is connected to motor element through the shaft coupling.

According to at least one embodiment of the present disclosure, a coupling includes a first link, a second link, and a third link, the second link being disposed between the first link and the third link, the first link and the third link being rigid components, the second link being a non-rigid component.

According to at least one embodiment of the present disclosure, the first coupling member, the second coupling member and the third coupling member are all fingers, and the three members are in staggered fit, so that the three members do not generate relative displacement along the circumferential direction of the coupling.

According to at least one embodiment of the present disclosure, a threaded rod assembly includes a threaded rod, a nut tube assembly includes a nut and a nut tube, the nut is fixed at a first end of the nut tube; the first end of the threaded rod is connected with the inner ring of the worm wheel of the worm gear transmission mechanism through a spline, and the threaded rod is connected with the nut of the nut tube assembly in a threaded fit mode.

According to at least one embodiment of the present disclosure, the second end of the threaded rod is configured with a stop assembly, the nut tube circumferentially forming a female collar, the stop assembly and the female collar being such that the nut tube assembly cannot be disengaged from the threaded tube assembly.

According to at least one embodiment of the present disclosure, the first ball and socket assembly is an automotive body side ball and socket assembly, and the second ball and socket assembly is an automotive rear cover hinge side ball and socket assembly; the ball socket assembly on the automobile body side is connected with a ball head of an automobile body in a ball socket mode, and the ball socket assembly on the automobile rear cover hinge side is connected with the ball head of an automobile rear cover hinge in a ball socket mode. The automobile rear cover driving device is connected between an automobile body and an automobile rear cover hinge.

According to at least one embodiment of the present disclosure, the nut tube assembly is fixedly connected with the second ball and socket assembly through the second end of the nut tube.

According to at least one embodiment of the present disclosure, the helix angle of the worm gear is parallel to the axial direction of the threaded rod.

According to at least one embodiment of the present disclosure, the spring is a tension spring or a compression spring, and the spring is a cylindrical coil spring.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural view of a rear cover driving apparatus (rocker arm type driving apparatus) of an automobile in the related art.

Fig. 2 is a schematic structural view of an automobile rear cover driving apparatus according to one embodiment of the present disclosure.

Fig. 3 is an exploded perspective view of an automotive tailgate drive apparatus according to one embodiment of the present disclosure.

Fig. 4 is a schematic diagram of the mating of a first coupling, a second coupling, and a third coupling of a coupling of an automotive tailgate drive, according to one embodiment of the present disclosure.

Fig. 5 is a schematic diagram of the mating of a threaded rod assembly and a nut tube assembly of an automotive tailgate drive according to one embodiment of the present disclosure.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.

The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.

When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," "below … …," "below … …," "below," "above … …," "above," "… …," "higher," and "side (e.g., as in" side walls ") to describe one component's relationship to another (other) component as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.

As shown in fig. 2, an automobile rear cover driving apparatus according to an embodiment of the present disclosure includes: the gearbox assembly 2, the motor assembly 3, the threaded rod assembly 4 and the nut tube assembly 5; the gear box assembly 2 transmits the motion output by the motor assembly 3 to the threaded rod assembly 4, so that the threaded rod assembly 4 rotates; the threaded rod assembly 4 is connected with the nut tube assembly 5 in a threaded fit manner; rotation of the threaded rod assembly 4 rotates the nut tube assembly 5 so that the nut tube assembly 5 reciprocates in the axial direction of the threaded rod assembly 4.

It should be understood by those skilled in the art that the automobile rear cover driving apparatus in the present embodiment can be installed between an automobile body and an automobile rear cover for driving the automobile rear cover. It will also be appreciated by those skilled in the art that the motor assembly 3 has an output shaft, and that the motion (rotation) output by the output shaft of the motor assembly 3 is transmitted to the threaded rod assembly 4. Through the screw-thread fit connection of threaded rod subassembly 4 and nut pipe subassembly 5, nut pipe subassembly 5 rotates under the rotatory drive of threaded rod subassembly 4 to make nut pipe subassembly 5 carry out reciprocating motion along the axial of threaded rod subassembly 4, or express as making nut pipe subassembly 5 carry out linear motion around threaded rod subassembly 4.

Preferably, the automobile rear cover driving apparatus of the above embodiment further includes a first ball and socket assembly 1 and a second ball and socket assembly 7; the first ball and socket assembly 1 is fixedly connected with the gearbox assembly 2, and the nut tube assembly 5 is fixedly connected with the second ball and socket assembly 7.

According to one embodiment of the present disclosure, the first ball and socket assembly 1 is an automotive body-side ball and socket assembly 1, and the second ball and socket assembly 7 is an automotive rear cover hinge-side ball and socket assembly 7; the automobile body side ball socket assembly 1 is connected with a ball head of an automobile body in a ball socket mode, and the automobile rear cover hinge side ball socket assembly 7 is connected with the ball head of an automobile rear cover hinge in a ball socket mode, so that the automobile rear cover driving device is connected between the automobile body and the automobile rear cover.

In conjunction with the schematic structural view of the automobile tailgate driving apparatus shown in fig. 2 and the exploded schematic perspective view of the automobile tailgate driving apparatus shown in fig. 3, it is preferable that the first ball and socket assembly 1 (the automobile body side ball and socket assembly 1) is fastened to the gear box assembly 2 by screws 8, and fig. 3 shows 4 screws 8, however, the present disclosure does not limit the number of the screws 8, and those skilled in the art can make a suitable choice on the number of the screws 8. Preferably, the motor assembly 3 is fastened to the gearbox assembly 2 by means of screws 9, fig. 3 showing 3 screws 9, however the present disclosure does not limit the number of screws 9 and a person skilled in the art can make a suitable choice of the number of screws 9.

The fit of a ball socket to a ball head is well within the skill of the art and the disclosure is not repeated herein.

Preferably, as shown in fig. 2 and 3, the rear cover driving device for the automobile in the above embodiment further includes a spring 6, and the spring 6 is sleeved on the outer sides of the threaded rod assembly 4 and the nut tube assembly 5; a first end of the spring 6 is fixedly connected to the first ball and socket assembly 1 and a second end of the spring 6 is fixedly connected to the second ball and socket assembly 7.

The spring 6 extends in the same direction as the reciprocating direction of the nut tube assembly 5.

In the automobile rear cover driving apparatus of the present disclosure, in order to balance the weight of the automobile rear cover, a spring 6 is fixed between the gear box assembly 2 and the second ball and socket assembly 7 (the automobile rear cover hinge-side ball and socket assembly 7), and the force value of the spring 6 is preferably appropriately selected according to the weight of the automobile rear cover. To save space, the spring 6 is mounted coaxially outside the threaded rod assembly 4 and the nut tube assembly 5. According to different configurations of the rear cover driving device of the automobile of the present disclosure, the spring 6 may be a tension spring or a compression spring.

When the first ball-and-socket assembly 1 (the ball-and-socket assembly 1 on the automobile body side) is arranged at a position relative to the rear of the automobile and the second ball-and-socket assembly 7 (the ball-and-socket assembly 7 on the automobile rear cover hinge side) is arranged at a position relative to the front of the automobile, the reduction of the distance between the first ball-and-socket assembly 1 (the ball-and-socket assembly 1 on the automobile body side) and the second ball-and-socket assembly 7 (the ball-and-socket assembly 7 on the automobile rear cover hinge side) represents the opening of the rear.

When the first ball-and-socket assembly 1 (the ball-and-socket assembly 1 on the automobile body side) is arranged at a position in front of the automobile and the second ball-and-socket assembly 7 (the ball-and-socket assembly 7 on the automobile rear cover hinge side) is arranged at a position in back of the automobile, the increase of the distance between the first ball-and-socket assembly 1 (the ball-and-socket assembly 1 on the automobile body side) and the second ball-and-socket assembly 7 (the ball-and-socket assembly 7 on the automobile rear cover hinge side) represents the opening of the rear cover, and.

As shown in fig. 3, the gear box assembly 2 preferably includes worm gears 10,11, the worm gears 10,11 including a worm wheel 11 and a worm 10, the worm gears 10,11 reversing the motion output by the motor assembly 3.

The worm 10 and the worm wheel 11 in the gear box assembly 2 cooperate to convert the movement (rotational movement) of the worm 10 into the rotational movement of the worm wheel 11. The worm wheel 11 and the worm 10 realize that the motor assembly 3 is arranged at the non-coaxial position of the gear box assembly 2, and a conventional planetary gear transmission is not adopted, so that the cost and the space in the length direction of the automobile rear cover driving device are optimized.

The rear cover driving apparatus for the vehicle of the present embodiment further includes couplings 16,17,18, and an output shaft (not shown) of the motor assembly 3 is connected to the worm 10 inside the gear housing assembly 2 through the couplings 16,17, 18.

Preferably, the coupling of the rear cover driving apparatus for an automobile of the present disclosure includes a first coupling member 16, a second coupling member 17, and a third coupling member 18, the second coupling member 17 is disposed between the first coupling member 16 and the third coupling member 18, the first coupling member 16 and the third coupling member 18 are rigid components, and the second coupling member 17 is a non-rigid component. It will be understood by those skilled in the art that rigid components refer to components that are not easily deformed, preferably metal components (e.g. cast iron components, steel components, alloy components, etc.), and non-rigid components refer to components that are easily deformed, preferably hard rubber components. It is preferred in the present disclosure that the first coupling member 16 and the third coupling member 18 be metal components and the second coupling member 17 be a hard rubber component.

When motor element 3 moved, transient state impact absorbed through the deformation of the rubber of hard rubber part 17 to optimize the fluctuation of motor element 3 output, obtain more gentle output, make this disclosed automobile rear cover drive arrangement's electric operation more stable.

Fig. 4 is a schematic diagram of the cooperation of the first coupling member 16, the second coupling member 17, and the third coupling member 18 of the coupling of the automobile tailgate driving apparatus according to one embodiment of the present disclosure. The torque transmission of the motor assembly 3 is realized by a first coupling member 16 (metal finger assembly 16), a third coupling member 18 (metal finger assembly 18) and a second coupling member 17 (hard rubber assembly 17) which are mutually matched. The first 16, second 17 and third 18 coupling members are all finger-like members, and the first 16, second 17 and third 18 coupling members are interfitted so that the first 16, second 17 and third 18 coupling members do not undergo relative displacement in the circumferential direction of the coupling. It will be understood by those skilled in the art that the shape of the first, second and third couplers 16,17 and 18 shown in fig. 4 is the preferred shape shown in the present disclosure, and those skilled in the art, given the benefit of this disclosure, will be able to make appropriate changes to the shape of the first, second and third couplers 16,17 and 18 so that the first, second and third couplers 16,17 and 18 do not shift relative to each other in the circumferential direction of the couplers.

Fig. 5 is a schematic diagram of the engagement of the threaded rod assembly 4 and the nut tube assembly 5 of the automotive tailgate drive according to one embodiment of the present disclosure. Referring to fig. 3 and 5, the threaded rod assembly 4 includes a threaded rod 12, the nut tube assembly 5 includes a nut 14 and a nut tube 15, the nut 14 is fixed to a first end of the nut tube 15; the first end of the threaded rod 12 is connected with the inner ring of the worm wheel 11 of the worm gear transmission mechanism through splines, and the threaded rod 12 is connected with the nut 14 of the nut tube assembly 5 through thread matching.

Referring to fig. 3 and 5, in more detail, the nut 14 in the nut tube assembly 5 is secured to the nut tube 15. The threaded rod 12 in the threaded rod assembly 4 is in threaded fit with the nut 14 in the nut rod 12, and the nut tube assembly 5 is driven to linearly move back and forth along the threaded rod 12 by the rotation of the threaded rod assembly 4. The second end of a nut tube 15 in the nut tube component 5 is fixed on the automobile rear cover hinge side ball socket component 7, the first end of a threaded rod component 4 is fixed in the gear box component 2, the gear box component 2 and the automobile body side ball socket component 1 are fixed together, and rotation of the threaded rod 12 enables the automobile body side ball socket component 1 and the automobile rear cover hinge side ball socket component 7 to linearly stretch along the axis of the threaded rod 12, so that opening and closing of the automobile rear cover are pushed.

The inner ring of the worm wheel 11 is matched with the threaded rod 12 in the threaded rod assembly 4 through the spline, so that the threaded rod 12 is driven to rotate. In order to improve the transmission efficiency, the helix angle of the worm wheel 11 and the axial direction of the threaded rod 12 are parallel, so that the energy that can be transmitted from the worm 10 to the worm wheel 11 is used to drive the worm wheel 11 to rotate. Meanwhile, under the non-electric operation working condition, the hand operation force of the user transmitted from the automobile rear cover can be reversely transmitted to the worm wheel 11 through the threaded rod 12, the motor component 3 is driven to rotate with the worm wheel, and the hand operation force of the user can be optimized.

As shown in fig. 5, preferably, the second end of the threaded rod 12 of the threaded rod assembly 4 is provided with a stopper assembly 13, a female ring 19 is formed in the circumferential direction of the nut tube 15, and the stopper assembly 13 and the female ring 19 prevent the nut tube assembly 5 from being disengaged from the threaded tube assembly 4. Preferably, a female ring 19 is arranged in the middle of the nut tube 15. Fig. 5 preferably shows one recessed ring 19, and those skilled in the art will appreciate that the present disclosure is not particularly limited to the number of recessed ring 19.

In order to prevent the rear cover of the automobile from being opened too far, a stopper assembly 13 is riveted to the end (second end) of the threaded rod 12 in the threaded rod assembly 4, and a nut tube concave ring 19 is riveted to the nut tube 15 in the nut tube assembly 5. In extreme conditions, the nut rod 15 travels to the end (second end) of the threaded rod 12 and is retained by the nut tube female ring 19 with the retainer assembly 13 within the threaded rod assembly 4, thereby preventing the nut tube assembly 5 from disengaging from the threaded rod assembly 4 and ensuring part integrity.

In one embodiment of the disclosure, a motor in a motor assembly of the automobile rear cover driving device starts to operate after receiving voltage input of an automobile controller, a worm gear in a gear box assembly is driven to rotate through a coupler, and then a threaded rod assembly is driven to rotate through a spline in a worm gear, so that a nut tube assembly matched on the threaded rod assembly moves back and forth along the threaded rod. The other end of the nut rod assembly is connected to a ball socket of a hinge of the rear cover of the automobile, and the ball socket assembly at the hinge side of the rear cover of the automobile is connected to the hinge through a ball head; and the gear box assembly is fixed on the ball socket assembly at the side of the automobile body, and the ball socket assembly at the side of the automobile body is connected to the automobile body through a ball head, so that the rotary motion of a motor is converted into the linear telescopic motion of the electric rear cover driving device, and the hinge of the rear cover of the automobile is pushed and pulled, thereby realizing the electric opening and closing of the rear cover of the automobile.

The utility model discloses a lid drive arrangement behind car passes through the threaded rod rotation on the motor element, the gear box subassembly drive threaded rod subassembly for nut pipe subassembly on the threaded rod is along threaded rod front and back linear motion, promotes lid hinge behind the car, has realized opening and closing of back lid. The weight of the automobile rear cover is balanced through the spring which is coaxially arranged with the threaded rod assembly and the nut pipe assembly, and the torque requirement of the motor is effectively reduced; the worm gear transmission mechanism of the gear box assembly is used for transmitting the motion of the motor assembly, so that the arrangement space of the automobile rear cover driving device on the length is reduced, and the sound performance of transmission is improved; particularly, by the parallel worm gear design of the helical angle, the transmission efficiency is further improved, and the resistance of manual reverse rotation is reduced; the multi-piece type coupling structure design effectively improves the stability of a transmission system, and the automobile rear cover driving device has the advantages of simple structure, low cost, compact arrangement, small space occupation of a luggage compartment, high transmission efficiency, stable transmission, good sound effect and the like.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Description of reference numerals:

1' electric machine

2' rocker arm

3' connecting rod

4' back cover hinge

5' rear cover

1 automobile body side ball socket assembly

2 Gear box assembly

3 electric machine assembly

4 threaded rod assembly

5 threaded pipe assembly

6 spring

7 automobile rear cover hinge side ball socket assembly

8 screw

9 screw

10 worm

11 worm wheel

12 threaded rod

13 spacing subassembly

14 nut

15 nut tube

16 first coupling assembly

17 second coupling assembly

18 third coupling Assembly

19 nut tube female ring.

Claims (10)

1. An automobile rear cover driving apparatus, comprising: the gear box assembly, the motor assembly, the threaded rod assembly and the nut pipe assembly;

the gearbox assembly transmits motion output by the motor assembly to the threaded rod assembly such that the threaded rod assembly rotates;

the threaded rod assembly is connected with the nut pipe assembly in a threaded fit manner;

rotation of the threaded rod assembly rotates the nut tube assembly such that the nut tube assembly reciprocates axially along the threaded rod assembly.

2. The automotive rear cover driving apparatus according to claim 1, further comprising a first ball and socket assembly and a second ball and socket assembly; the first ball and socket assembly is fixedly connected with the gearbox assembly, and the nut tube assembly is fixedly connected with the second ball and socket assembly.

3. The automotive rear cover driving device according to claim 2, further comprising a spring fitted over an outer side of the threaded rod assembly and the nut tube assembly; the first end of the spring is fixedly connected with the first ball socket assembly, and the second end of the spring is fixedly connected with the second ball socket assembly.

4. The automotive tailgate drive according to any of claims 1-3, characterized in that the gearbox assembly comprises a worm gear transmission reversing the motion output by the motor assembly.

5. The vehicle tailgate drive according to claim 4, wherein the worm gear drive comprises a worm wheel and a worm, the vehicle tailgate drive further comprising a coupling, the worm being connected to the motor assembly through the coupling.

6. The vehicle rear cover drive device according to claim 5, wherein the coupling includes a first coupling member, a second coupling member, and a third coupling member, the second coupling member being disposed between the first coupling member and the third coupling member, the first coupling member and the third coupling member being rigid members, and the second coupling member being a non-rigid member.

7. The vehicle rear cover driving apparatus according to claim 6, wherein the first coupling member, the second coupling member and the third coupling member are all finger-shaped members, and they are alternately engaged so that they do not relatively displace in a circumferential direction of the coupling member.

8. The automotive rear cover driving apparatus according to any one of claims 5 to 7, wherein the screw rod assembly includes a screw rod, the nut tube assembly includes a nut fixed to a first end of the nut tube and a nut tube; the first end of the threaded rod is connected with the inner ring of the worm wheel and worm transmission mechanism through a spline, and the threaded rod is connected with the nut of the nut tube assembly in a threaded fit mode.

9. The vehicle rear cover drive device as recited in claim 8, wherein the second end of the threaded rod is provided with a stop assembly, the nut tube circumferentially forming a female ring, the stop assembly and the female ring preventing the nut tube assembly from disengaging from the threaded tube assembly.

10. The automobile tailgate driving device according to claim 2 or 3, characterized in that the first ball-and-socket assembly is an automobile body-side ball-and-socket assembly, and the second ball-and-socket assembly is an automobile tailgate hinge-side ball-and-socket assembly; the automobile body side ball socket assembly is connected with a ball head of an automobile body in a ball socket mode, and the automobile rear cover hinge side ball socket assembly is connected with the ball head of an automobile rear cover hinge in a ball socket mode.

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