Split sliding cover for refueling port of a vehicle

Abstract

The present application relates to a kind of split sliding type cover plate of automobile power supply port, cover or inlay in the cover plate hole at the corresponding position of automobile body sheet metal power supply port, including split cover plate, pedestal and driving device, pedestal and split cover plate are arranged in parallel, driving device is installed between pedestal and split cover plate, split cover plate is composed of multiple small cover plates, when opening cover plate, driving device is driven by screw block mechanism to drive walking shaft to drive small cover plate to slide outwards synchronously or to move towards automobile body from cover plate hole, and to open outwards, until power supply port is all exposed, limiting groove on pedestal cooperates with walking shaft, and the action track of small cover plate is limited.The split sliding type cover plate of the present application is simple in structure and easy to process, and the overall cost is low;It is convenient to realize full automation, and user experience is better and safer;All components are hidden in automobile body, and appearance is more beautiful.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile parts, in particular to a split sliding cover plate for a power supply port of an automobile. BACKGROUND

[0002] Automobiles all have power supply ports, gasoline or diesel vehicles have fueling ports, and electric vehicles have charging ports. In order to ensure safety and aesthetics, a cover plate is usually attached to the outer panel of the vehicle body outside the power supply port to cover the power supply port.

[0003] Most cover plates for power supply ports are flip type, and the cover plate is substantially perpendicular to the vehicle body when opened, occupying the external space at the supply port and possibly interfering with the fueling gun or charging equipment. In addition, when opening or closing the flip type cover plate, the driver first unlocks it through the in-vehicle pull cord or vehicle key remote control, and then manually opens and closes it, which has low automation and is an unsafe factor if the driver forgets to manually close it.

[0004] Therefore, some sliding cover plates have appeared. Chinese patent CN107042847A discloses an automatic sliding cover plate system for fueling ports and charging ports, and a connecting rod drives the cover plate assembly to move in a direction parallel to the vehicle body. Chinese patent CN213383874U discloses a translation fuel tank door, and the base and the panel are connected in a hinged manner by a balance bar, and the opening position of the panel is parallel to the vehicle body. The above solutions all involve a whole sliding cover plate.

[0005] Chinese patent CN112849276A discloses a cover structure composed of multiple split cover bodies. The three sides of the split cover body are arc-shaped surfaces. The shaft body below the split cover body is connected with a limiting block. The guide column of the shaft body cooperates with the spiral guide groove of the shaft sleeve. The lower part of the shaft sleeve has a driven gear. The motor drives the shaft sleeve to rotate through the gear ring and the driven gear. The spiral guide groove of the shaft sleeve drives the shaft body and the split cover body to slide outward and then rotate open, thereby opening the cover. The closing action is the reverse of the opening action. The split cover body of this cover structure has a complex action, so the corresponding parts have a complex structure, and some structures are difficult to process, such as the three arc-shaped sides of the split cover body, the spiral guide groove on the shaft sleeve, and the matching block on the shaft body, which have high manufacturing costs. In addition, it is difficult to completely match the arc-shaped contact surfaces when the split cover body is closed, which affects the sealing performance of the cover plate.

[0006] From the above whole sliding cover plate and split cover body sliding cover plate, it can be seen that the sliding cover plate has its own advantages: it does not occupy the external space of the vehicle body, the experience of power supply operation is better, it is convenient to realize full automatic operation, it does not need human operation, it is simpler and safer, and the back surface is not exposed, and the appearance is beautiful. The sliding cover plate is a novel and fashionable cover plate form, but it is currently less applied. In the future, more simple and practical sliding cover plates need to be designed. SUMMARY

[0007] In view of the above-mentioned defects or shortcomings of the prior art, the present application provides a new split sliding cover plate with simple structure, simple operation and better sealing performance.

[0008] To solve the above-mentioned technical problems, the present application has the following configuration:

[0009] The split sliding cover plate of the power supply port of the automobile is located at the cover plate hole corresponding to the position of the power supply port on the body panel, and characterized in that it comprises a split cover plate, a base and a driving device; the split cover plate is composed of a plurality of small cover plates obtained by equally dividing a circular cover plate, in the closed state, the plurality of small cover plates are spliced into a complete split cover plate to cover or inlay the cover plate hole; when the cover plate is opened, each small cover plate synchronously slides radially outward until the power supply port is completely exposed to the open state; the base is arranged in parallel with the split cover plate and located on the side of the split cover plate away from the cover plate hole, the center of the base is provided with an opening to avoid the power supply port; the driving device is installed between the base and the split cover plate, the driving device comprises a power source, a plurality of driving rod assemblies and a plurality of transmission rod assemblies, each small cover plate is provided with a driving rod assembly behind it, a transmission rod assembly is arranged between adjacent driving rod assemblies, the start and stop of the power source are controlled by an external control signal; each driving rod assembly comprises a driving gear, a driving screw and a walking shaft, the driving screw shaft with external threads in the shape of a long shaft is arranged in parallel with the split cover plate along the diameter direction of the cover plate, the driving gear is fixed at the end of the driving screw facing the center of the cover plate, the walking shaft is perpendicularly installed between the small cover plate and the base, one end of the walking shaft is fixedly connected with the small cover plate, and the other end of the walking shaft is inserted into the corresponding limiting groove on the base, the driving screw passes through the internal thread hole of the walking shaft, and the driving screw and the walking shaft form a screw sliding block mechanism; each transmission rod assembly comprises a transmission rod, the transmission rod shaft in the shape of a long shaft is arranged in parallel with the split cover plate along the diameter direction of the cover plate, and further comprises a coaxial transmission gear fixed to the end of the transmission rod facing the center of the cover plate; the support column installed on the base supports the driving screw and the transmission rod; the driving gear is engaged with the adjacent transmission gear, the transmission gear is engaged with the next driving gear, and all the gears form a closed circle in this way, one of the driving gears rotates, the other driving gears and the driving screw rotate synchronously and in the same direction, and the walking shaft and the small cover plate are driven to synchronously and in the same direction by the screw sliding block mechanism.

[0010] The walking shaft can be replaced by a connecting body and a guide pin shaft, the connecting body is a crank-shaped part, including a cover plate connecting column, a track shaft, a sheet-shaped crank arm and a crank pin, the cover plate connecting column and the track shaft are short shafts with parallel axes, are separately arranged on the two sides of the crank arm, the cylindrical crank pin is located between the two crank arms, the axis is parallel to the cover plate connecting column, the cover plate connecting column is fixed with a small cover plate, and the track shaft is inserted into a limiting groove in the base; the guide pin shaft is provided with an internal thread through hole in the side surface, a through hole is formed in the end surface of the guide pin shaft, the axis of the through hole is perpendicular to the axis of the internal thread through hole, and a driving screw rod passes through the internal thread hole of the guide pin shaft; there is a gap between the end surface of the guide pin shaft and the crank arm of the connecting body; the track shaft is in gap cooperation with the limiting groove on the base, and the longitudinal section shape of the limiting groove is that the groove bottom is first flat, gradually becomes shallow near the center of the base, and the shallow section is arc-shaped; when the small cover plate is opened, the small cover plate is first moved to the vehicle body interior direction from the position inlaid in the cover plate hole and is radially opened, after avoiding the cover plate hole, the small cover plate is radially slid and opened; conversely, when the small cover plate is closed, the small cover plate is first slid to the center of the base, then is radially closed and is vertically moved to the cover plate hole, and is inlaid in the cover plate hole.

[0011] The limiting groove of the base is provided with a circular limiting hole at one end in the length direction towards the center of the base, the end of the track shaft of the connecting body in contact with the limiting groove is a limiting ball, the diameter of the limiting ball is greater than the diameter of the track shaft, the diameter of the limiting hole is smaller than the diameter of the limiting ball, the limiting ball is completely out of the limiting hole, and the diameters of the limiting hole and the limiting ball determine the final position of the cover plate in the vertical direction.

[0012] The connecting body needs to be divided into two parts, the through hole in the end surface of the guide pin shaft is sleeved on the crank pin of the connecting body, and then the two part bodies are fixedly connected.

[0013] The power source is a motor and a gear transmission group.

[0014] Compared with the prior art, the advantages of the present application are that:

[0015] The split sliding cover plate scheme of the present application uses a simple screw rod and sliding block mechanism, each part does not have special modeling and difficult machining features, the structure is simple and easy to process, and the overall cost is low.

[0016] The cover plate opening and closing process of the present application is easy to realize full automation, does not need manual assistance, has better user experience and is safer.

[0017] All mechanisms are arranged in the vehicle body interior regardless of the cover plate opening and closing state, do not occupy external space, avoid interference with a refueling gun or charging equipment, are convenient to operate and are more beautiful. DRAWINGS

[0018] Figure 1 : The explosion diagram of the split sliding cover plate of the present application;

[0019] Figure 2: A three-dimensional assembly drawing of the split sliding cover plate of the present invention;

[0020] Figure 3 : Figure 2 A magnified view of part A;

[0021] Figure 4 : Top view of the split sliding cover plate of the present invention. Detailed Implementation

[0022] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention.

[0023] It should be noted that in the description of this invention, the directions or positional relationships indicated by directional terms such as "up," "down," "left," and "right" are based on the orientation shown in the accompanying drawings and are only for the purpose of simplifying the description, rather than indicating that the elements must have a specific orientation, and therefore should not be construed as limiting the invention.

[0024] like Figure 1 As shown, the split sliding cover of the automotive power supply port 500 (fueling port or charging port) of the present invention covers or is embedded in the cover hole 100. The cover hole 100 is an opening on the body sheet metal at the corresponding position of the power supply port 500. Opening and closing the split sliding cover makes the power supply port 500 exposed or hidden.

[0025] The split sliding cover plate of the present invention includes a split cover plate 200. The diameter of the split cover plate 200 is either larger than that of the cover plate hole 100 and covers the inner wall of the cover plate hole 100, or equal to that of the cover plate hole 100 and is embedded in the cover plate hole 100.

[0026] The split cover 200 is composed of multiple small cover plates 210 equally divided from a circular cover plate. In the closed state, the multiple small cover plates 210 are assembled into a complete split cover 200 to cover or embed in the cover plate hole 100, concealing the power supply port 500. When the cover is opened, each small cover plate 210 slides outward radially until the power supply port 500 is fully exposed, which is the open state.

[0027] The number of small cover plates 210 can be varied according to actual needs, and an even number of small cover plates 210 is preferred.

[0028] The base 400 and the split cover plate 200 are arranged in parallel. Figure 2 ), that is, the mounting surface of base 400 ( Figure 2 The upper and middle surfaces are parallel to the surface of the split cover plate 200. The base 400 is located on the side of the split cover plate 200 away from the cover hole 100. The center of the base 400 has an opening to avoid the power supply port 500, so that when the split cover plate 200 is opened, refueling or charging can be directly operated from the opening.

[0029] The synchronous sliding movement of each small cover plate 210 of the split cover plate 200 is completed by the driving device 300. As shown in Figure 1 , Figure 2 The driving device 300 is installed between the base 400 and the split cover plate 200, and includes a power source 310, a plurality of driving rod assemblies 320, and a plurality of transmission rod assemblies 330. Each small cover plate 210 is provided with a driving rod assembly 320, so the number of driving rod assemblies 320 is equal to the number of small cover plates 210 of the split cover plate 200. In order to make each small cover plate 210 slide radially synchronously, a transmission rod assembly 330 is arranged between adjacent driving rod assemblies 320, and the transmission rod assembly 330 plays a role of transmitting power and changing direction.

[0030] Referring to Figure 3 , each driving rod assembly 320 includes a driving gear 321, a driving screw 322, and a walking shaft 323. The driving screw 322, which is long and has external threads, is arranged along the diameter of the cover plate with its axis parallel to the surface of the split cover plate 200. The driving gear 321 is fixed to the end of the driving screw 322 that faces the center of the cover plate. The walking shaft 323 is installed between the upper small cover plate 210 and the lower base 400, and its axis is perpendicular to the surface of the small cover plate 210 and the mounting surface of the base 400. One end of the walking shaft 323 is fixedly connected to the small cover plate 210, and the other end is inserted into the corresponding limiting groove 410 of the base 400. The driving screw 322 passes through the internal threaded hole of the walking shaft 323, and the driving screw 322 and the walking shaft 323 form a screw sliding block mechanism.

[0031] As shown in Figure 3 , each transmission rod assembly 330 includes a transmission rod 332, which is long and has its axis arranged along the diameter of the cover plate with its axis parallel to the split cover plate 200. The transmission rod assembly 330 also includes a coaxial transmission gear 331 fixed to the end of the transmission rod 332 that faces the center of the cover plate.

[0032] As shown in Figure 2 , Figure 3 The driving gear 321 is engaged with the adjacent transmission gear 331, the transmission gear 331 is engaged with the next driving gear 321, and so on. All the gears form a closed circle around the center of the split cover plate 200. The power source 310 drives one of the driving gears 321 and the driving screw 322 to rotate. The driving gear 321 drives the next driving gear 321 and the driving screw 322 to rotate through the adjacent transmission gear 331. In this way, all the driving gears 321 and the driving screws 322 rotate synchronously and in the same direction, and the walking shaft 323 and the small cover plate 210 slide synchronously and in the same direction through the screw sliding block mechanism.

[0033] The power source 310 of the driving device 300 can be installed on the base 400. The power source 310 includes a power source and its transmission device, the power source 310 drives one set of driving rod assemblies 320 to act, and the driving rod assemblies 320 drive other driving rod assemblies 320 to act. The power source 310 is preferably a motor and a gear transmission group (see Figure 3

[0034] When the driving device 300 opens the split cover plate 200 in response to an external control signal, the power source 310 starts to drive the driving lead screw 322 and the driving gear 321 of one set of driving rod assemblies 320, the rotation of the driving lead screw 322 is converted into the linear movement of each walking shaft 323 through the lead screw slider mechanism, and each walking shaft 323 drives each small cover plate 210 to slide radially, opening and closing the split cover plate 200.

[0035] A plurality of support columns 420 (see Figure 1 、 Figure 2 ) are arranged on the base 400 for supporting the driving lead screw 322 and the transmission rod 332, the support column 420 is a small cylinder installed perpendicular to the surface of the base 400, each driving lead screw 322 and transmission rod 332 passes through the transverse hole of the corresponding support column 420 respectively, and is axially fixed, and can still rotate freely in the circumferential direction, the support column 420 surrounds a circle concentric with the inner hole of the base 400, Figure 4 The support column 420 of the embodiment shown is located on the side of the driving gear 321 and the transmission gear 331 away from the center of the base 400.

[0036] It can be understood that the support column 420 is a fixed support for the driving rod assembly 320, and the walking shaft 323 is another moving support.

[0037] The limiting groove 410 on the base 400 is a plurality of narrow grooves (see Figure 1 、 Figure 2 ) equidistantly arranged on the mounting surface of the base 400, each walking shaft 323 (or small cover plate) corresponds to a limiting groove 410, the groove path of the limiting groove 410 corresponds to the walking path of the walking shaft 323 (i.e. the sliding path of the small cover plate), the length and position of the limiting groove 410 are determined according to the limit position of the small cover plate 210, the opening limit position of the small cover plate 210 is determined according to the size of the automobile power supply port 500, and the automobile power supply port 500 is fully exposed, the number of limiting grooves 410 is equal to the number of small cover plates 210.

[0038] The position of the split cover plate 200 in the open state can be limited by the length of the limiting groove 410, or the start and stop of the driving device 300 can be controlled by the external control system.

[0039] ​The first embodiment is that the outer diameter of the split cover plate 200 is larger than the cover plate hole 100, the split cover plate 200 covers the inside of the cover plate hole 100 (towards the inside of the vehicle body), the split cover plate 200 is not flush with the vehicle body sheet metal, and the action of the split cover plate 200 is only radial sliding.

[0040] In combination Figure 2 to Figure 4 The second embodiment is described.

[0041] When the split cover plate 200 of the second embodiment is closed, the split cover plate 200 is inlaid in the cover plate hole 100 and flush with the vehicle body sheet metal, forming a smooth and smooth same plane. At the initial stage of opening the split cover plate 200, the small cover plate 210 is withdrawn towards the inside of the vehicle body and slides towards the periphery, avoiding the vehicle body sheet metal, and then the small cover plate 210 continues to slide radially until it is fully opened. Such a hidden cover plate is more fashionable and beautiful, but the action of the cover plate is more complex. In addition to radial sliding, the cover plate also needs to add the action of retracting and pushing out relative to the vehicle body sheet metal, that is, the action of the cover plate in the vertical direction of the cover plate hole 100 is increased compared with the first embodiment.

[0042] In the second embodiment, the running shaft 323 of the drive rod assembly 320 is replaced by a connecting body and a guide pin shaft 350 Figure 3 The connecting body is a crank-shaped part, which includes four parts: a cover plate connecting column 341, a track shaft 342, a thin sheet-shaped crank arm 343, and a crank pin 344. The cover plate connecting column 341 and the track shaft 342 are short shafts with parallel axes and are separately arranged on both sides of the two crank arms 343. The cylindrical crank pin 344 is located between the two crank arms 343, and the axis is parallel to the cover plate connecting column 341. The cover plate connecting column 341 is fixed with the small cover plate 210, and the track shaft 342 is inserted into the limiting groove 410 of the base 400. The guide pin shaft 350 has an internal threaded hole on the side surface, and a through hole is opened on the end surface, and the axis of the through hole is perpendicular to the internal threaded hole. The drive screw 322 passes through the internal threaded hole of the guide pin shaft 350. In order to install the guide pin shaft 350 on the connecting body, the connecting body needs to be divided into two parts, and then the through hole on the end surface of the guide pin shaft 350 is inserted into the crank pin 344 of the connecting body, and finally the two parts are fixed and connected.

[0043] Figure 3 As can be seen from the figure, the height of the crank pin 344 is greater than the height of the guide pin shaft 350, and there is a gap a between the end surface of the guide pin shaft 350 and the crank arm 343 of the connecting body. Therefore, the connecting body can move relative to the guide pin shaft 350 in the up-down direction of the figure (the vertical direction of the cover plate), and the maximum movement is a. Reflecting on the split cover plate 200, it can be understood that in addition to the drive screw 322 driving the guide pin shaft 350 to drive the connecting body and the small cover plate 210 to slide radially along the cover plate, the connecting body and the small cover plate 210 can also move in the direction perpendicular to the cover plate, and the maximum displacement is the gap a.

[0044] The motion track of the small cover plate 210 is determined by the structure of the connecting body and the limiting groove 410 cooperating therewith, see Figure 4 The end of the track shaft 342 of the connecting body contacting the limiting groove 410 is a sphere, referred to as the limiting sphere 345, and the diameter of the limiting sphere 345 is greater than the diameter of the track shaft 342, so that the cross section of the elongated limiting groove 410 is in the shape of a groove width (cooperating with the limiting body) groove mouth narrow (cooperating with the track shaft) (see Figure 2 The limiting groove 410 cooperates with the limiting sphere 345 and the track shaft 342 in a clearance fit; the longitudinal section (the longitudinal direction is the groove length direction) of the limiting groove 410 is in the shape of a flat groove bottom, gradually shallow near the center of the base 400, and the shallow section is arc-shaped (see Figure 4 Therefore, the connecting body has displacement in both the horizontal and vertical directions when in the arc-shaped section.

[0045] In combination with the drawings shown in Figure 1 , Figure 2 and Figure 4 , when the small cover plate 210 is opened, in the initial stage, the drive screw 322 drives the track shaft 342 of the connecting body to move downward and left along the circular arc of the groove bottom of the limiting groove 410, and then to translate along the straight line of the groove bottom (see Figure 4 Reflecting on the motion of the small cover plate 210, the small cover plate 210 first moves from the position of being embedded in the cover plate hole 100 to the inside of the vehicle body while being radially opened, and after avoiding the cover plate hole 100, continues to slide open only in the radial direction (see Figure 1 Conversely, when the small cover plate 210 is closed, the track shaft 342 first moves right along the straight line of the groove bottom of the limiting groove 410, and in the final stage, moves right and upward along the arc-shaped groove bottom (see Figure 4 That is, the small cover plate 210 first slides to the center of the base 400, and then closes radially while moving vertically to the cover plate hole 100, until it is embedded in the cover plate hole 100 (see Figure 1 ).

[0046] Such a split cover plate structure requires that the cover plate be flush with the vehicle body sheet metal when closed, that is, the limit position of the cover plate in the vertical direction of the cover plate must be very accurate, otherwise the cover plate will protrude or recess into the vehicle body sheet metal, which is an unacceptable condition. In order to accurately control the position of the split cover plate 200 when closed, the length direction of the limiting groove 410 of the base 400 of the present embodiment is opened at one end towards the center of the base 400, see Figure 2 The limiting hole 411 cooperates with the limiting sphere 345 below the connecting body, and the diameter of the limiting hole 411 is smaller than the diameter of the limiting sphere 345, which can limit the complete escape of the sphere, and the size of the diameters determines the position of the limiting sphere 345 escaping from the limiting hole 411, that is, whether the final position of the connecting body and the small cover plate 210 in the vertical direction of the cover plate is flush with the vehicle body sheet metal when the cover plate is closed.

[0047] The simple structure of the limiting hole 411 and the connecting body (and the limiting ball) achieves the limiting purpose, which can ensure the accurate position of the cover when it is closed, and improve the sealing performance and appearance of the split cover.

[0048] The second embodiment, featuring a split sliding cover plate embedded in the cover plate hole 100, modifies the structure of the travel shaft 323 of the drive device 300. This creates a gap between the guide pin 350 and the connecting body, allowing the connecting body to move vertically relative to the guide pin 350. The shape matching between the travel shaft 323 and the limiting groove 410 enables combined radial and vertical movements when the split cover plate 200 initially leaves the cover plate hole 100 during opening and gradually engages with the cover plate hole 100 during closing. Furthermore, the engagement of the limiting hole 411 at the end of the limiting groove 410 of the base 400 and the upper limit ball 345 of the travel shaft 323 restricts the position of the limiting ball 345 from disengaging from the limiting hole 411, thus determining the final vertical position of the split cover plate and ensuring that the split cover plate 200 is flush with the vehicle body sheet metal when closed. The structure is simple and practical, achieving better cover plate sealing and a more aesthetically pleasing appearance.

[0049] The split sliding cover of this invention utilizes a screw-slider mechanism to synchronously drive each separate cover to open or close. It features a simple structure without complex mechanisms, and the parts have no special shapes or difficult-to-process characteristics, resulting in easy manufacturing and low overall cost. It also has other significant advantages: 1. The opening and closing process is easily automated, requiring no manual assistance, leading to a better and safer user experience; 2. All mechanisms, regardless of the cover's open or closed state, are located inside the vehicle body, occupying no external space and avoiding interference with refueling nozzles or charging equipment, making operation convenient and more aesthetically pleasing.

[0050] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. A split sliding cover plate of a refueling port of an automobile, located at a cover plate hole (100) corresponding to a position of a refueling port (500) of a body panel of the automobile, characterized in that, The utility model relates to a kind of power supply cover, including split cover plate (200), pedestal (400) and driving device (300); The split cover plate (200) is composed of multiple small cover plates (210) by a circular cover plate, in the closed state, multiple small cover plates (210) are combined to form the complete split cover plate (200) and cover or inlay in the cover plate hole (100);When the split sliding cover plate is opened, each small cover plate (210) slides radially outward synchronously until the power supply opening (500) is fully exposed to the open state; The pedestal (400) is arranged in parallel with the split cover plate (200), located on the side of the split cover plate (200) away from the cover plate hole (100), and the pedestal (400) is centrally bored to avoid the power supply opening (500); The driving device (300) is installed between the pedestal (400) and the split cover plate (200), the driving device (300) includes a power source (310), multiple groups of driving rod assemblies (320) and multiple groups of transmission rod assemblies (330), each small cover plate (210) is installed behind a group of driving rod assemblies (320), a group of transmission rod assemblies (330) is arranged between adjacent driving rod assemblies (320), and the start and stop of the power source (310) is controlled by an external control signal. Each of the drive rod assemblies (320) comprises a drive gear (321), a drive screw (322), and a walking shaft (323). The drive screw (322) is a long shaft with external threads, and its axis is parallel to the split cover plate (200) and arranged along the diameter direction of the cover plate. The drive gear (321) is fixed to the end of the drive screw (322) towards the center of the cover plate. The walking shaft (323) is vertically installed between the small cover plate (210) and the base (400), and one end is fixedly connected to the small cover plate (210) and the other end is inserted into the corresponding limiting groove (410) of the base (400). The drive screw (322) passes through the internal threaded hole of the walking shaft (323), and the drive screw (322) and the walking shaft (323) form a screw sliding block mechanism. Each of the transmission rod assemblies (330) comprises a transmission rod (332) and a coaxial transmission gear (331) fixed to the end of the transmission rod (332) towards the center of the cover plate. The support column (420) installed on the base (400) supports the drive screw (322) and the transmission rod (332). The drive gear (321) is engaged with the adjacent transmission gear (331), and the transmission gear (331) is engaged with the next drive gear (321), and so on. All gears form a closed circle. One of the drive gears (321) of the power source (310) rotates, and the other drive gears (321) and the drive screw (322) rotate synchronously and in the same direction, driving the walking shaft (323) and the small cover plate (210) to slide synchronously and in the same direction through the screw sliding block mechanism. The walking shaft (323) comprises a connecting body and a guide pin shaft (350). The connecting body is a crankshaft-shaped part, which includes a cover plate connecting column (341), a trajectory shaft (342), a sheet-shaped crank arm (343), and a crank pin (344). The cover plate connecting column (341) and the trajectory shaft (342) are short shafts with parallel axes and are arranged on both sides of the two crank arms (343). The crank pin (344) is a cylindrical part located between the two crank arms (343) with an axis parallel to the cover plate connecting column (341). The cover plate connecting column (341) is fixed to the small cover plate (210), and the trajectory shaft (342) is inserted into the limiting groove (410) of the base (400). The guide pin shaft (350) has an internal threaded hole on its side surface and a through hole on its end surface. The axis of the through hole is perpendicular to the axis of the internal threaded hole. The drive screw (322) passes through the internal threaded hole of the guide pin shaft (350), and the crank pin (344) of the connecting body passes through the through hole of the guide pin shaft (350). There is a gap (a) between the end surface of the guide pin shaft (350) and the crank arm (343) of the connecting body. The trajectory axis (342) is matched with the limiting groove (410) on the base (400), the longitudinal section shape of the limiting groove (410) is that the groove bottom is flat first, then gradually shallow near the center of the base (400), the shallow section is arc-shaped, when the small cover plate (210) is opened, it is first moved to the inside of the vehicle body from the position inlaid in the cover plate hole (100) and then opened radially, after avoiding the cover plate hole (100), it is opened along the radial direction; conversely, when it is closed, the small cover plate (210) is first slid to the center of the base (400), then it is closed radially and moved vertically to the cover plate hole (100), until it is inlaid in the cover plate hole (100); The connecting body needs to be divided into two parts, the through hole of the end face of the guide pin shaft (350) is sleeved into the crank pin (344) of the connecting body, and then the two split parts are fixedly connected; The length direction of the limiting groove (410) of the base (400) is provided with a circular limiting hole (411) at the end towards the center of the base (400), the end of the trajectory axis (342) of the connecting body in contact with the limiting groove (410) is a limiting ball (345), the diameter of the limiting ball (345) is greater than the diameter of the trajectory axis (342), the diameter of the limiting hole (411) is smaller than the diameter of the limiting ball (345), the limiting ball is completely out of the limiting hole, and the diameters of the limiting hole (411) and the limiting ball (345) determine the final position of the cover plate in the vertical direction.

2. The split sliding filler door cover for a motor vehicle according to claim 1, wherein The power source (310) is a motor and a gear transmission group.

Images