A flap assembly

Abstract

This utility model discloses a lid assembly, comprising: a lid base with an opening; a cover plate rotatably connected to the lid base via a pin to open or close the opening; an elastic energy storage device installed between the lid base and the cover plate, the elastic energy storage device being configured such that its elastic force can drive the cover plate to open; and a locking mechanism installed between the lid base and the cover plate, the locking mechanism being configured to keep the cover plate in a closed state and to release the cover plate from the closed state. The elastic energy storage device replaces an electric motor to provide the power to open the cover plate, improving the reliability of the lid assembly, significantly reducing design and production costs, and also reducing the difficulty of maintenance and repair of the lid assembly.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a cover assembly. Background Technology

[0002] With the electrification and intelligent upgrading of new energy vehicles, electric charging port covers are used to enhance the sense of technology. However, when setting up electric drive devices, it is necessary to consider not only issues such as electromagnetic interference resistance, but also to build redundant control logic that is deeply matched with the vehicle's electronic and electrical architecture. The software involves multi-system collaborative control. Currently, the industry has a relatively high failure rate due to issues such as CAN communication delay and false triggering. In terms of cost, the mechatronics structure significantly increases the cost per unit compared to traditional mechanical structures. Coupled with environmental durability, EMC and other verification projects, the R&D and testing costs account for a high proportion of the total investment. These technical pain points are prone to user complaints, which directly affect brand reputation and market competitiveness. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a cover assembly that uses an elastic energy storage device to drive the cover plate to open, so as to improve the problems of cover plate opening failure rate and high design and development cost.

[0004] To achieve the above and other related objectives, this utility model provides a lid assembly, comprising: a lid base having an opening; a lid plate rotatably connected to the lid base via a pin to open or close the opening; an elastic energy storage device installed between the lid base and the lid plate, the elastic energy storage device being configured such that its elastic force can drive the lid plate to open; and a locking mechanism installed between the lid base and the lid plate, the locking mechanism being configured to hold the lid plate in a closed state and to release the lid plate from the closed state.

[0005] Preferably, the elastic energy storage device includes a drive gear, an arc rack, and an elastic element. The drive gear is rotatably connected to the base of the housing, the arc rack is connected to the cover plate, the arc rack meshes with the drive gear, and the elastic element is assembled such that when the cover plate is in a closed state, the elastic element is in a deformable energy storage state, and its elastic force can drive the drive gear to rotate in a way that drives the cover plate to open.

[0006] Preferably, the lid assembly further includes a guide limiting mechanism, which includes a guide limiting pin and a guide limiting groove that cooperate with each other. The guide limiting groove is an arc-shaped through groove that is concentric with the arc-shaped rack and is opened on the arc-shaped rack. The guide limiting pin is fixedly connected to the lid base and is located in the arc-shaped through groove.

[0007] Preferably, the cover assembly further includes a damping mechanism for providing damping to the cover when it is opened.

[0008] Preferably, the damping mechanism includes a rotary damper, which is mounted on the base of the housing, and the drive gear is connected to the damping output end of the rotary damper.

[0009] Preferably, the locking mechanism includes a locking groove and a locking pin assembly, one of which is located on the cover plate and the other is located on the base of the opening box; the locking groove has a first flange at at least one side of the groove opening, and the locking pin assembly includes a base and a pin, the end of the pin has a second flange, and the pin is rotatably connected to the base so that the pin can switch between the following angles:

[0010] At a first angle, in response to the open state of the cover plate, the projection of the second flange along the pin axial direction overlaps with the projection of the first flange along the pin axial direction; and

[0011] At the second angle, in response to the closed state of the cover plate, the projection of the second flange on the pin axis does not overlap with the projection of the first flange on the pin axis.

[0012] Preferably, the pin is movably connected to the base along the axial direction so that the pin can switch between a first axial position and a second axial position. A linkage mechanism is provided between the pin and the base. The linkage mechanism is configured to rotate the pin from a first angle to a second angle when the pin moves from the first axial position to the second axial position, and to rotate the pin from the second angle to the first angle when the pin moves from the second axial position to the first axial position.

[0013] Preferably, the linkage mechanism includes:

[0014] A spiral groove is formed on the outer peripheral wall of the pin along the axial direction; a guide sleeve is connected to the base for the pin to pass through; and a guide post is fixedly connected to the inner wall of the guide sleeve and can slide in the spiral groove, so as to drive the pin to rotate when it moves axially.

[0015] Preferably, a retaining mechanism is provided between the pin and the base, the retaining mechanism being assembled to hold the pin in the second axial position and to release the pin from the second axial position.

[0016] Preferably, the retaining mechanism includes:

[0017] The locking component has its top end connected to the bottom end of the pin. The bottom end of the locking component is provided with a plurality of first protrusions along its outer circumferential surface, and the top end of each first protrusion has a first inclined surface.

[0018] The driving component is connected between the pin and the locking component. The outer circumferential surface of the driving component is provided with multiple second protrusions, and the bottom end of the driving component is a driving part with a serrated ring structure.

[0019] A resilient reset element is connected between the base and the locking element;

[0020] A locking cylinder connected to the base has multiple protruding toothed columns inside, with adjacent toothed columns forming a sliding groove. The bottom end of the toothed column has a locking port, and the two sides of the locking port have second inclined surfaces that are adapted to the first inclined surface. When the driving member slides up and down in the sliding groove through the second protrusion, the driving part can cooperate with the elastic reset member and the second inclined surface to drive the locking member to rotate through the first inclined surface. When the pin is in the second axial position, the first protrusion rotates to the locking port and is limited by the locking port. When the pin is in the first axial position, the first protrusion rotates to the sliding groove and slides into the sliding groove.

[0021] The technical advantages of this invention are as follows: By installing an elastic energy storage device between the base of the lid and the cover plate, the elastic force is used as the driving force for opening the cover plate. Compared with the existing technology that uses an electric motor to drive the cover plate opening, this method has higher reliability and durability. In addition, due to the reduction in the use of electronic components, the lid assembly is also easier to maintain and repair, reducing the user's operating costs. The use of an elastic energy storage device including an elastic element, a drive gear, and an arc rack ensures the structural simplicity of the lid assembly, eliminating the need for a complex hinge mechanism, saving the design and manufacturing costs of the hinge mechanism, and reducing the weight of the lid assembly. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of the cap assembly of this utility model in one embodiment;

[0024] Figure 2 This is a three-dimensional structural diagram of the cap assembly of this utility model in one embodiment.

[0025] Figure 3 This is a schematic diagram showing the unfolded parts of the locking mechanism of the present invention, including the pin, driving component, locking component, and elastic reset component, in one embodiment.

[0026] Figure 4 This is a three-dimensional structural diagram of the guide sleeve / locking cylinder in one embodiment of the cover assembly of this utility model.

[0027] Label Explanation

[0028] 100. Base of the mouth box; 101. Notch; 200. Cover plate; 201. Locking groove; 2011. First flange; 202. Ball groove; 300. Elastic energy storage device; 301. Rotating shaft; 302. Elastic element; 303. Drive gear; 304. Circular arc rack; 3041. Guide limiting groove; 305. Guide limiting pin; 306. Torsion spring base; 307. Damping gear; 308. Ball plug; 400. Locking mechanism; 401. Pin; 4011. Spiral groove; 4012. Snap ring inlet; 4013. Cavity; 402 4021. Drive component; 4022. Second protrusion; 4023. Drive unit; 404. Locking component; 405. First protrusion; 406. First inclined surface; 407. Annular groove; 408. First spring; 409. Second inclined surface; 400. Second spring; 400. Guide sleeve / locking cylinder; 401. Locking port; 402. Slide groove; 403. Toothed post; 404. Second inclined surface; 405. Guide post; 406. Second flange; 407. Snap ring; 408. First support rod; 419. Second support rod; 410. Base; 500. Pin. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0030] Please see Figure 1 It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0031] This utility model provides a cover assembly, including a base and a cover plate. The base has an opening, and the cover plate is used to open or close the base. In the prior art, electric motors are often used to drive the cover plate to open, which results in high software logic control design costs and a relatively high failure rate due to CAN communication delays and false triggering. The cover assembly provided by this utility model can improve the working reliability of the cover plate and reduce design and manufacturing costs. Specifically, it works by installing an elastic energy storage device between the base and the cover plate, using a mechanical mechanism to act as a substitute for the electric motor. The technical solution of this utility model will be described in detail below with reference to specific embodiments:

[0032] Please see Figures 1 to 4 This utility model provides a lid assembly, including: a lid base 100 with an opening; a lid 200 rotatably connected to the lid base 100 via pins 500 to open or close the opening; in one specific embodiment, two pins 500 are provided at both ends of the side of the lid 200 and at both ends of the side of the lid base 100 to rotatably connect the lid 200 to the lid base 100; to enhance the reliability of the rotatable connection, pins 500 with pin holes at their ends can be selected, and safety pins are fitted into the pin holes; and an elastic energy storage device 300 installed between the lid base 100 and the lid 200, configured such that its elastic force can drive the lid 200 to open; in one specific embodiment, refer to... Figure 1 , Figure 2 The elastic energy storage device 300 is installed on the bottom surface of the cover plate 200 opposite to the opening and on the outer wall of the mouth box base 100. In other embodiments, the elastic energy storage device 300 may also be installed on the outer wall of the cover plate 200 and the outer wall of the mouth box base 100. A locking mechanism 400 is installed between the mouth box base 100 and the cover plate 200. The locking mechanism 400 is configured to hold the cover plate 200 in a closed state and to release the cover plate 200 from the closed state. In one specific embodiment, the locking mechanism 400 is installed on the mouth box base 100. In other embodiments, the locking mechanism 400 can also be installed on the outer wall of the box base 100 and the outer wall of the cover plate 200 on the bottom surface opposite to the opening of the box base 100. When it is necessary to open the opening, the locking mechanism 400 is unlocked first to release the cover plate 200 from the closed state. At this time, the elastic energy storage device 300 will drive the cover plate 200 to open through elastic force. When it is necessary to close the opening, the cover plate 200 can be pressed to its closed opening position, and then the locking mechanism 400 can lock the cover plate 200 in the closed opening state.

[0033] This invention utilizes an elastic energy storage device 300 installed between the base 100 and the cover 200, employing elastic force as the power to open the cover 200. Compared to existing devices that use an electric motor to open the cover 200, this invention offers higher reliability and durability, eliminates the need for software logic control, and reduces design costs. Furthermore, the reduced use of electronic components simplifies maintenance and repair of the cover assembly, further lowering user costs.

[0034] Please see Figure 1 , Figure 2 The elastic energy storage device 300 includes a drive gear 303, an arc rack 304, and an elastic element 302. The drive gear 303 is rotatably connected to the mouth box base 100, and the arc rack 304 is connected to the cover plate 200. The arc rack 304 meshes with the drive gear 303. The elastic element 302 is configured such that when the cover plate 200 is in a closed state, the elastic element 302 is in a deformable energy storage state, and its elastic force can drive the drive gear 303 to rotate in a way that drives the cover plate 200 to open. In a specific embodiment, a rotating shaft 301 can be rotatably connected to the outer wall of the mouth box base 100, and the drive gear 303 can be fixedly connected to the rotating shaft 301. The elastic element 302 is selected as a torsion spring fitted on the rotating shaft 301. A torsion spring base 306 is fixedly connected to the outer wall of the 00, and a limiting groove is opened on the torsion spring base 306 so that one end of the torsion spring can be inserted into the fixed groove. The torque direction of the torsion spring and the rotation direction of the rotating shaft 301 are precisely matched, which can realize the stable storage and rapid directional release of energy, ensure that the opening action of the cover 200 is smooth and without jamming, and improve the response efficiency. The drive gear 303 can be a sector gear to save installation space and reduce weight. In order to compensate for installation errors, the arc rack 304 and the cover 200 can be hinged through the ball groove 202 of the matching ball plug 308. In addition, a notch 101 can be opened on the edge of the mouth box base 100 for the bottom end of the arc rack 304 to pass through, ensuring the compactness of the mouth cover assembly.

[0035] The design structure of the aforementioned elastic energy storage device 300 ensures the overall structural simplicity of the cap assembly, eliminating the need for a complex hinge drive mechanism designed to accommodate the electric drive device. Taking the gooseneck electric charging cap as an example, complex molds are required when producing the hinge and the cap base 100. The hinge mold has a complex structure and needs to consider the pre-bending deformation at the root, making it difficult to control the size of the parts. The cap base 100 mold needs to be rotated and cored or processed into separate parts. This can significantly reduce manufacturing costs and also reduce the difficulty of maintenance and repair. In addition, by eliminating the hinge drive mechanism, the overall weight of the cap assembly is lighter, and the production size of the parts is easier to control, improving the standardization and interchangeability of the parts, further reducing the difficulty and cost of maintenance.

[0036] Please see Figure 2 The cap assembly also includes a guide limiting mechanism, which includes a guide limiting pin 305 and a guide limiting groove 3041 that cooperate with each other. The guide limiting groove 3041 is an arc-shaped through groove opened on the arc rack 304 and concentric with the arc rack 304. The guide limiting pin 305 is fixedly connected to the cap base 100 and is located in the arc-shaped through groove. The guide limiting mechanism can ensure that the arc rack 304 rotates along a preset path without deviation or disengagement from the drive gear 303, thereby improving the working reliability of the cap assembly. In a specific embodiment, an anti-disengagement part with a diameter larger than the width of the guide limiting groove 3041 can also be provided at the head of the limiting pin to further enhance the anti-disengagement effect.

[0037] Please see Figure 2 The cover assembly also includes a damping mechanism, which provides damping for the cover 200 when it is opened. In a specific embodiment, friction damping connected to the drive gear 303 or elastic damping connected to the elastic element 302 can be used. The damping mechanism can effectively reduce the opening speed of the cover 200 driven by the elastic energy storage device 300, avoid the rapid impact or vibration of the cover 200 caused by the instantaneous release of elastic force, reduce noise and impact, and improve the user experience. In addition, by buffering the inertial impact when the cover 200 is opened, stress concentration and wear of key components such as the pin 500 and the locking mechanism 400 can be reduced, the overall structure durability can be improved, and the risk of failure and maintenance costs caused by frequent impacts can be reduced.

[0038] Please see Figure 2 The damping mechanism includes a rotary damper, which is mounted on the mouth box base 100. The drive gear 303 is connected to the damping output end of the rotary damper. In a specific embodiment, the damping output end can be a damping gear 307 that meshes with the drive gear 303 and is rotatably connected to the mouth cover base 411.

[0039] Please see Figures 1 to 4 The locking mechanism 400 includes a locking groove 201 and a locking pin assembly. One of the locking groove 201 and the locking pin assembly is located on the cover plate 200, and the other is located on the mouth box base 100. In a specific embodiment, please refer to... Figure 1A locking groove 201 is formed on the cover plate 200, and a locking pin assembly is installed on the mouth box base 100. In other embodiments, the locking groove 201 can also be formed on the mouth box base 100, and the locking pin assembly can be installed on the cover plate 200. At least one side of the groove opening of the locking groove 201 is provided with a first flange 2011. In specific embodiments, first flanges 2011 can also be provided on both sides of the groove opening. The locking pin assembly includes a base 411 and a pin 401. The end of the pin 401 is provided with a second flange 407. The pin 401 is rotatably connected to the base 411 so that the pin 401 can switch between the following angles: a first angle, responding to... When the cover plate 200 is open, the projection of the second flange 407 on the pin 401 in the axial direction overlaps with the projection of the first flange 2011 on the pin 401 in the axial direction. At this time, the second flange 407 of the pin 401 can disengage from the first flange 2011. Also, in response to the closed state of the cover plate 200, the projection of the second flange 407 on the pin 401 in the axial direction does not overlap with the projection of the first flange 2011 on the pin 401 in the axial direction. In a specific embodiment, to enhance the reliability of the sealing effect, the projection of the second flange 407 on the pin 401 in the axial direction can be perpendicular to the projection of the first flange 2011 on the pin 401 in the axial direction.

[0040] By rotating the locking pin that engages with the locking groove 201, the cover plate 200 can be reliably locked and released easily and quickly.

[0041] Please see Figure 3 The pin 401 is movably connected to the base 411 along the axial direction, so that the pin 401 can switch between a first axial position and a second axial position. A linkage mechanism is provided between the pin 401 and the base 411. The linkage mechanism is configured to rotate the pin 401 from a first angle to a second angle when the pin 401 moves from the first axial position to the second axial position, and to rotate the pin 401 from the second angle to the first angle when the pin 401 moves from the second axial position to the first axial position. The user can apply pressure to the pin 401 by pressing the cover plate 200, so that the pin 401 generates axial movement and rotational movement at the same time, so as to quickly and conveniently realize the locking and unlocking between the cover plate 200 and the mouth box base 100.

[0042] Please see Figure 3 , Figure 4The linkage mechanism includes: a spiral groove 4011 axially formed on the outer peripheral wall of the pin 401; a guide sleeve 406 connected to the base 411 through which the pin 401 passes; and a guide post 4065 fixedly connected to the inner wall of the guide sleeve 406 and slidable in the spiral groove 4011, so as to drive the pin 401 to rotate when it moves axially. In a specific embodiment, when the guide post 4065 is located at the top of the spiral groove 4011, the pin 401 is at a first position and a first angle. When the pin 401 continues to move down to the second position, the pin 401 is at a second angle. Through the above spiral structure, the pin 401 can reliably generate axial movement and rotational movement at the same time.

[0043] Please see Figure 3 , Figure 4 A retaining mechanism is provided between the pin 401 and the base 411. The retaining mechanism is assembled to hold the pin 401 in the second axial position and to release the pin 401 from the second axial position.

[0044] Please see Figure 3 , Figure 4The retaining mechanism includes: a locking member 403, the top end of which is connected to the bottom end of a pin 401. In one specific embodiment, an annular groove 4033 can be formed at the top end of the locking member 403, and a retaining spring 408 insertion port 4012 can be formed on the outer peripheral wall of the bottom end of the pin 401. The retaining spring 408 is inserted into the annular groove 4033 through the retaining spring 408 insertion port 4012, connecting the two. A plurality of first protrusions 4031 are provided along the outer peripheral surface of the bottom end of the locking member 403, and the top end of the first protrusion 4031 has a first inclined surface 4032; and a driving member 402, which is connected between the pin 401 and the locking member 403. A plurality of second protrusions 4031 are provided on the outer peripheral surface of the driving member 402. The protruding post 4021 and the driving part 4022 with a sawtooth ring structure at the bottom end of the driving member 402; the elastic reset member, connected between the base 411 and the locking member 403, in one specific embodiment, a first support rod 409 can be provided on the base 411, and a first spring 404 located between the base 411 and the locking member 403 can be fitted on the first support rod 409. In other specific embodiments, in order to ensure the elastic strength, a cavity 4013 can be opened inside the pin 401, and a second support rod 410 can be provided in the cavity 4013, and a second spring 405 can be fitted on the second support rod 410; the locking cylinder 406 connected to the base 411, in a specific embodiment, in order to The compact structure allows the locking cylinder 406 and guide sleeve 406 to be integrated. Multiple toothed posts 4063 protrude from the locking cylinder 406, forming a sliding groove 4062 between adjacent toothed posts 4063. A locking port 4061 is located at the bottom of each toothed post 4063, and the two sides of the locking port 4061 have second inclined surfaces 4064 that are compatible with the first inclined surface 4032. When the driving member 402 slides up and down within the sliding groove 4062 via the second protrusion 4021, the driving member 4022, in conjunction with the elastic reset member and the second inclined surface 4064, drives the locking member 403 to rotate via the first inclined surface 4032. When the pin 401 is in the second axial position, the first protrusion 4031 rotates to... The locking port 4061 limits the pin 401, thus holding it in the second axial position. When the pin 401 is in the first axial position, the first protrusion 4031 rotates to the slide groove 4062 and enters the slide groove 4062, thereby releasing the pin 401 from the second axial position. The user only needs to apply pressure to the pin 401 by pressing the cover plate 200, and the driving member 402 can slide up and down under the pressure and the thrust of the elastic reset member, so that the locking member 403 rotates between the locking port 4061 and the slide groove 4062, thereby locking and releasing the pin 401 connected to the locking member 403, thus conveniently and quickly locking and releasing the cover plate 200 in the closed state.

[0045] In summary, this utility model effectively overcomes some practical problems in the prior art, thus having high utilization value and significance.

[0046] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A flap assembly characterized in that, include: A mouth box base, wherein the mouth box base is provided with an opening; The cover plate is rotatably connected to the base of the opening box by a pin to open or close the opening; An elastic energy storage device is installed between the mouth box base and the cover plate, and the elastic energy storage device is configured such that its elastic force can drive the cover plate to open. A locking mechanism is installed between the mouth box base and the cover plate. The locking mechanism is configured to keep the cover plate in a closed state and to release the cover plate from the closed state.

2. The flap assembly of claim 1, wherein The elastic energy storage device includes a drive gear, an arc rack, and an elastic element. The drive gear is rotatably connected to the base of the mouth box, the arc rack is connected to the cover plate, and the arc rack meshes with the drive gear. The elastic element is assembled such that when the cover plate is in a closed state, the elastic element is in a deformable energy storage state, and its elastic force can drive the drive gear to rotate in a way that drives the cover plate to open.

3. The flap assembly of claim 2, wherein, It also includes a guide limiting mechanism, which includes a guide limiting pin and a guide limiting groove that cooperate with each other. The guide limiting groove is an arc through groove that is concentric with the arc rack and is opened on the arc rack. The guide limiting pin is fixedly connected to the base of the mouth box and is located in the arc through groove.

4. The flap assembly of claim 2, wherein It also includes a damping mechanism for providing damping to the cover when the cover is opened.

5. The flap assembly of claim 4, wherein, The damping mechanism includes a rotary damper, which is mounted on the base of the mouth box, and the drive gear is connected to the damping output end of the rotary damper.

6. The flap assembly of claim 1, wherein The locking mechanism includes a locking groove and a locking pin assembly, one of which is located on the cover plate and the other is located on the base of the housing; the locking groove has a first flange at at least one side of its opening, and the locking pin assembly includes a base and a pin, the end of which has a second flange; the pin is rotatably connected to the base so that the pin can switch between the following angles: At a first angle, in response to the open state of the cover plate, the projection of the second flange on the pin axial direction overlaps with the projection of the first flange on the pin axial direction. as well as The second angle, in response to the closed state of the cover plate, is such that the projection of the second flange on the pin axial direction does not overlap with the projection of the first flange on the pin axial direction.

7. The flap assembly of claim 6, wherein The pin is movably connected to the base along the axial direction so that the pin can switch between a first axial position and a second axial position. A linkage mechanism is provided between the pin and the base. The linkage mechanism is configured to rotate the pin from the first angle to the second angle when the pin moves from the first axial position to the second axial position, and to rotate the pin from the second angle to the first angle when the pin moves from the second axial position to the first axial position.

8. The flap assembly of claim 7, wherein, The linkage mechanism includes: A spiral groove is formed on the outer peripheral wall of the pin along the axial direction; A guide sleeve is connected to the base through which the pin passes, and a guide post is fixedly connected to the inner wall of the guide sleeve and can slide in the spiral groove, so as to drive the pin to rotate when it moves axially.

9. The flap assembly of claim 6, wherein, A retaining mechanism is provided between the pin and the base. The retaining mechanism is configured to hold the pin in the second axial position and to release the pin from the second axial position.

10. The flap assembly of claim 9, wherein, The retaining mechanism includes: The locking component has its top end connected to the bottom end of the pin. The bottom end of the locking component is provided with a plurality of first protrusions along its outer circumferential surface, and the top end of each first protrusion has a first inclined surface. The driving component is connected between the pin and the locking component. The outer circumferential surface of the driving component is provided with multiple second protrusions, and the bottom end of the driving component is a driving part with a serrated ring structure. A resilient reset element is connected between the base and the locking element; A locking cylinder connected to the base has multiple protruding toothed columns inside, with adjacent toothed columns forming a sliding groove. The bottom end of the toothed column has a locking port, and the two sides of the locking port have second inclined surfaces that are adapted to the first inclined surface. When the driving member slides up and down in the sliding groove through the second protrusion, the driving part can cooperate with the elastic reset member and the second inclined surface to drive the locking member to rotate through the first inclined surface. When the pin is in the second axial position, the first protrusion rotates to the locking port and is limited by the locking port. When the pin is in the first axial position, the first protrusion rotates to the sliding groove and slides into the sliding groove.

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